X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FScripting%2FNasalPositioned.cxx;h=25d28bb40c1c549c1e168eefddfc0c383d14b9ad;hb=ce09c320d32728dd9c5eb0d6b4ab9f4683242cbc;hp=78e1bc8d7316dd126cd09be4a9ea6497d2981a59;hpb=fb66aeade146502e14ee8deee4cd597e27f87bde;p=flightgear.git

diff --git a/src/Scripting/NasalPositioned.cxx b/src/Scripting/NasalPositioned.cxx
index 78e1bc8d7..25d28bb40 100644
--- a/src/Scripting/NasalPositioned.cxx
+++ b/src/Scripting/NasalPositioned.cxx
@@ -27,29 +27,88 @@
 #include "NasalPositioned.hxx"
 
 #include <boost/foreach.hpp>
+#include <boost/algorithm/string/case_conv.hpp>
+#include <boost/tuple/tuple.hpp> // for boost::tie
 
+#include <simgear/sg_inlines.h>
 #include <simgear/scene/material/mat.hxx>
 #include <simgear/magvar/magvar.hxx>
 #include <simgear/timing/sg_time.hxx>
 #include <simgear/bucket/newbucket.hxx>
 
 #include <Airports/runways.hxx>
-#include <Airports/simple.hxx>
+#include <Airports/airport.hxx>
 #include <Airports/dynamics.hxx>
 #include <Airports/parking.hxx>
+#include <Scripting/NasalSys.hxx>
 #include <Navaids/navlist.hxx>
 #include <Navaids/procedure.hxx>
 #include <Main/globals.hxx>
 #include <Main/fg_props.hxx>
 #include <Scenery/scenery.hxx>
 #include <ATC/CommStation.hxx>
-#include <Navaids/route.hxx>
+#include <Navaids/FlightPlan.hxx>
+#include <Navaids/waypoint.hxx>
+#include <Navaids/fix.hxx>
 #include <Autopilot/route_mgr.hxx>
+#include <Navaids/routePath.hxx>
 #include <Navaids/procedure.hxx>
+#include <Navaids/airways.hxx>
+#include <Navaids/NavDataCache.hxx>
 
-static void sgrefGhostDestroy(void* g);
-naGhostType PositionedGhostType = { sgrefGhostDestroy, "positioned" };
-naGhostType WayptGhostType = { sgrefGhostDestroy, "waypoint" };
+using namespace flightgear;
+
+static void positionedGhostDestroy(void* g);
+static void wayptGhostDestroy(void* g);
+static void legGhostDestroy(void* g);
+static void routeBaseGhostDestroy(void* g);
+
+naGhostType PositionedGhostType = { positionedGhostDestroy, "positioned" };
+
+static const char* airportGhostGetMember(naContext c, void* g, naRef field, naRef* out);
+naGhostType AirportGhostType = { positionedGhostDestroy, "airport", airportGhostGetMember, 0 };
+
+static const char* navaidGhostGetMember(naContext c, void* g, naRef field, naRef* out);
+naGhostType NavaidGhostType = { positionedGhostDestroy, "navaid", navaidGhostGetMember, 0 };
+
+static const char* runwayGhostGetMember(naContext c, void* g, naRef field, naRef* out);
+naGhostType RunwayGhostType = { positionedGhostDestroy, "runway", runwayGhostGetMember, 0 };
+naGhostType HelipadGhostType = { positionedGhostDestroy, "helipad", runwayGhostGetMember, 0 };
+naGhostType TaxiwayGhostType = { positionedGhostDestroy, "taxiway", runwayGhostGetMember, 0 };
+
+static const char* fixGhostGetMember(naContext c, void* g, naRef field, naRef* out);
+naGhostType FixGhostType = { positionedGhostDestroy, "fix", fixGhostGetMember, 0 };
+
+static const char* wayptGhostGetMember(naContext c, void* g, naRef field, naRef* out);
+static void waypointGhostSetMember(naContext c, void* g, naRef field, naRef value);
+
+naGhostType WayptGhostType = { wayptGhostDestroy, 
+  "waypoint",
+  wayptGhostGetMember,
+  waypointGhostSetMember};
+
+static const char* legGhostGetMember(naContext c, void* g, naRef field, naRef* out);
+static void legGhostSetMember(naContext c, void* g, naRef field, naRef value);
+
+naGhostType FPLegGhostType = { legGhostDestroy, 
+  "flightplan-leg",
+  legGhostGetMember,
+  legGhostSetMember};
+
+static const char* flightplanGhostGetMember(naContext c, void* g, naRef field, naRef* out);
+static void flightplanGhostSetMember(naContext c, void* g, naRef field, naRef value);
+
+naGhostType FlightPlanGhostType = { routeBaseGhostDestroy, 
+  "flightplan",
+  flightplanGhostGetMember,
+  flightplanGhostSetMember
+};
+
+static const char* procedureGhostGetMember(naContext c, void* g, naRef field, naRef* out);
+naGhostType ProcedureGhostType = { routeBaseGhostDestroy, 
+  "procedure",
+  procedureGhostGetMember,
+  0};
 
 static void hashset(naContext c, naRef hash, const char* key, naRef val)
 {
@@ -65,894 +124,2139 @@ static naRef stringToNasal(naContext c, const std::string& s)
                    s.length());
 }
 
+static WayptFlag wayptFlagFromString(const char* s)
+{
+  if (!strcmp(s, "sid")) return WPT_DEPARTURE;
+  if (!strcmp(s, "star")) return WPT_ARRIVAL;
+  if (!strcmp(s, "approach")) return WPT_APPROACH;
+  if (!strcmp(s, "missed")) return WPT_MISS;
+  if (!strcmp(s, "pseudo")) return WPT_PSEUDO;
+  
+  return (WayptFlag) 0;
+}
+
+static naRef wayptFlagToNasal(naContext c, unsigned int flags)
+{
+  if (flags & WPT_PSEUDO) return stringToNasal(c, "pseudo");
+  if (flags & WPT_DEPARTURE) return stringToNasal(c, "sid");
+  if (flags & WPT_ARRIVAL) return stringToNasal(c, "star");
+  if (flags & WPT_MISS) return stringToNasal(c, "missed");
+  if (flags & WPT_APPROACH) return stringToNasal(c, "approach");
+  return naNil();
+}
+
 static FGPositioned* positionedGhost(naRef r)
 {
-    if (naGhost_type(r) == &PositionedGhostType)
+    if ((naGhost_type(r) == &AirportGhostType) ||
+        (naGhost_type(r) == &NavaidGhostType) ||
+        (naGhost_type(r) == &RunwayGhostType) ||
+        (naGhost_type(r) == &FixGhostType))
+    {
         return (FGPositioned*) naGhost_ptr(r);
+    }
+  
     return 0;
 }
 
-static flightgear::Waypt* wayptGhost(naRef r)
+static FGAirport* airportGhost(naRef r)
 {
-  if (naGhost_type(r) == &WayptGhostType)
-    return (flightgear::Waypt*) naGhost_ptr(r);
+  if (naGhost_type(r) == &AirportGhostType)
+    return (FGAirport*) naGhost_ptr(r);
   return 0;
 }
 
-static void sgrefGhostDestroy(void* g)
+static FGNavRecord* navaidGhost(naRef r)
 {
-    SGReferenced* ref = (SGReferenced*)g;
-    SGReferenced::put(ref); // unref
+  if (naGhost_type(r) == &NavaidGhostType)
+    return (FGNavRecord*) naGhost_ptr(r);
+  return 0;
 }
 
-static naRef airportPrototype;
-static naRef routePrototype;
-static naRef waypointPrototype;
-
-naRef ghostForPositioned(naContext c, const FGPositioned* pos)
+static FGRunway* runwayGhost(naRef r)
 {
-    if (!pos) {
-        return naNil();
-    }
-    
-    SGReferenced::get(pos); // take a ref
-    return naNewGhost(c, &PositionedGhostType, (void*) pos);
+  if (naGhost_type(r) == &RunwayGhostType)
+    return (FGRunway*) naGhost_ptr(r);
+  return 0;
 }
 
-naRef ghostForWaypt(naContext c, const flightgear::Waypt* wpt)
+static FGTaxiway* taxiwayGhost(naRef r)
 {
-  if (!wpt) {
-    return naNil();
-  }
-  
-  SGReferenced::get(wpt); // take a ref
-  return naNewGhost(c, &WayptGhostType, (void*) wpt);
+  if (naGhost_type(r) == &TaxiwayGhostType)
+    return (FGTaxiway*) naGhost_ptr(r);
+  return 0;
 }
 
-naRef hashForAirport(naContext c, const FGAirport* apt)
+static FGFix* fixGhost(naRef r)
 {
-    std::string id = apt->ident();
-    std::string name = apt->name();
-    
-  // build runways hash
-    naRef rwys = naNewHash(c);
-    for(unsigned int r=0; r<apt->numRunways(); ++r) {
-      FGRunway* rwy(apt->getRunwayByIndex(r));
-      naRef rwyid = stringToNasal(c, rwy->ident());
-      naRef rwydata = hashForRunway(c, rwy);
-      naHash_set(rwys, rwyid, rwydata);
-    }
-  
-    naRef aptdata = naNewHash(c);
-    hashset(c, aptdata, "id", stringToNasal(c, id));
-    hashset(c, aptdata, "name", stringToNasal(c, name));
-    hashset(c, aptdata, "lat", naNum(apt->getLatitude()));
-    hashset(c, aptdata, "lon", naNum(apt->getLongitude()));
-    hashset(c, aptdata, "elevation", naNum(apt->getElevation() * SG_FEET_TO_METER));
-    hashset(c, aptdata, "has_metar", naNum(apt->getMetar()));
-    hashset(c, aptdata, "runways", rwys);
-    hashset(c, aptdata, "_positioned", ghostForPositioned(c, apt));
-    naRef parents = naNewVector(c);
-    naVec_append(parents, airportPrototype);
-    hashset(c, aptdata, "parents", parents);
-    
-    return aptdata;
+  if (naGhost_type(r) == &FixGhostType)
+    return (FGFix*) naGhost_ptr(r);
+  return 0;
 }
 
-naRef hashForWaypoint(naContext c, flightgear::Waypt* wpt, flightgear::Waypt* next)
+
+static void positionedGhostDestroy(void* g)
 {
-  SGGeod pos = wpt->position();
-  naRef h = naNewHash(c);
-  
-  flightgear::Procedure* proc = dynamic_cast<flightgear::Procedure*>(wpt->owner());
-  if (proc) {
-    hashset(c, h, "wp_parent_name", stringToNasal(c, proc->ident()));
-    // set 'wp_parent' route object to query the SID / STAR / airway?
-    // TODO - needs some extensions to flightgear::Route
-  }
+    FGPositioned* pos = (FGPositioned*)g;
+    if (!FGPositioned::put(pos)) // unref
+        delete pos;
+}
 
-  if (wpt->type() == "hold") {
-    hashset(c, h, "fly_type", stringToNasal(c, "Hold"));
-  } else if (wpt->flag(flightgear::WPT_OVERFLIGHT)) {
-    hashset(c, h, "fly_type", stringToNasal(c, "flyOver"));
-  } else {
-    hashset(c, h, "fly_type", stringToNasal(c, "flyBy"));
-  }
-  
-  hashset(c, h, "wp_type", stringToNasal(c, wpt->type()));
-  hashset(c, h, "wp_name", stringToNasal(c, wpt->ident()));
-  hashset(c, h, "wp_lat", naNum(pos.getLatitudeDeg()));
-  hashset(c, h, "wp_lon", naNum(pos.getLongitudeDeg()));
-  hashset(c, h, "alt_cstr", naNum(wpt->altitudeFt()));
-  
-  if (wpt->speedRestriction() == flightgear::SPEED_RESTRICT_MACH) {
-    hashset(c, h, "spd_cstr", naNum(wpt->speedMach()));
-  } else {
-    hashset(c, h, "spd_cstr", naNum(wpt->speedKts()));
-  }
+static Waypt* wayptGhost(naRef r)
+{
+  if (naGhost_type(r) == &WayptGhostType)
+    return (Waypt*) naGhost_ptr(r);
   
-  if (next) {
-    std::pair<double, double> crsDist =
-      next->courseAndDistanceFrom(pos);
-    hashset(c, h, "leg_distance", naNum(crsDist.second * SG_METER_TO_NM));
-    hashset(c, h, "leg_bearing", naNum(crsDist.first));
-    hashset(c, h, "hdg_radial", naNum(wpt->headingRadialDeg()));
+  if (naGhost_type(r) == &FPLegGhostType) {
+    FlightPlan::Leg* leg = (FlightPlan::Leg*) naGhost_ptr(r);
+    return leg->waypoint();
   }
   
-// leg bearing, distance, etc
-  
-  
-// parents and ghost of the C++ object
-  hashset(c, h, "_waypt", ghostForWaypt(c, wpt));
-  naRef parents = naNewVector(c);
-  naVec_append(parents, waypointPrototype);
-  hashset(c, h, "parents", parents);
-  
-  return h;
-
+  return 0;
 }
 
-naRef hashForRunway(naContext c, FGRunway* rwy)
+static void wayptGhostDestroy(void* g)
 {
-    naRef rwyid = stringToNasal(c, rwy->ident());
-    naRef rwydata = naNewHash(c);
-#define HASHSET(s,l,n) naHash_set(rwydata, naStr_fromdata(naNewString(c),s,l),n)
-    HASHSET("id", 2, rwyid);
-    HASHSET("lat", 3, naNum(rwy->latitude()));
-    HASHSET("lon", 3, naNum(rwy->longitude()));
-    HASHSET("heading", 7, naNum(rwy->headingDeg()));
-    HASHSET("length", 6, naNum(rwy->lengthM()));
-    HASHSET("width", 5, naNum(rwy->widthM()));
-    HASHSET("threshold", 9, naNum(rwy->displacedThresholdM()));
-    HASHSET("stopway", 7, naNum(rwy->stopwayM()));
-        
-    if (rwy->ILS()) {
-      HASHSET("ils_frequency_mhz", 17, naNum(rwy->ILS()->get_freq() / 100.0));
-      HASHSET("ils", 3, hashForNavRecord(c, rwy->ILS(), SGGeod()));
-    }
-    
-    HASHSET("_positioned", 11, ghostForPositioned(c, rwy));
-#undef HASHSET
-    return rwydata;
+  Waypt* wpt = (Waypt*)g;
+  if (!Waypt::put(wpt)) // unref
+    delete wpt;
 }
 
-naRef hashForNavRecord(naContext c, const FGNavRecord* nav, const SGGeod& rel)
+static void legGhostDestroy(void* g)
 {
-    naRef navdata = naNewHash(c);
-#define HASHSET(s,l,n) naHash_set(navdata, naStr_fromdata(naNewString(c),s,l),n)
-    HASHSET("id", 2, stringToNasal(c, nav->ident()));
-    HASHSET("name", 4, stringToNasal(c, nav->name()));
-    HASHSET("frequency", 9, naNum(nav->get_freq()));
-    HASHSET("lat", 3, naNum(nav->get_lat()));
-    HASHSET("lon", 3, naNum(nav->get_lon()));
-    HASHSET("elevation", 9, naNum(nav->get_elev_ft() * SG_FEET_TO_METER));
-    HASHSET("type", 4, stringToNasal(c, nav->nameForType(nav->type())));
-    
-// FIXME - get rid of these, people should use courseAndDistance instead
-    HASHSET("distance", 8, naNum(SGGeodesy::distanceNm( rel, nav->geod() ) * SG_NM_TO_METER ) );
-    HASHSET("bearing", 7, naNum(SGGeodesy::courseDeg( rel, nav->geod() ) ) );
-    
-    // record the real object as a ghost for further operations
-    HASHSET("_positioned",11, ghostForPositioned(c, nav));
-#undef HASHSET
-    
-    return navdata;
+  // nothing for now
 }
 
-bool geodFromHash(naRef ref, SGGeod& result)
+
+static FlightPlan::Leg* fpLegGhost(naRef r)
 {
-  if (!naIsHash(ref)) {
-    return false;
-  }
-  
-// first, see if the hash contains a FGPositioned ghost - in which case
-// we can read off its position directly
-  naRef posGhost = naHash_cget(ref, (char*) "_positioned");
-  if (!naIsNil(posGhost)) {
-    FGPositioned* pos = positionedGhost(posGhost);
-    result = pos->geod();
-    return true;
-  }
-  
-  naRef ghost = naHash_cget(ref, (char*) "_waypt");
-  if (!naIsNil(ghost)) {
-    flightgear::Waypt* w = wayptGhost(ghost);
-    result = w->position();
-    return true;
-  }
-  
-// then check for manual latitude / longitude names
-  naRef lat = naHash_cget(ref, (char*) "lat");
-  naRef lon = naHash_cget(ref, (char*) "lon");
-  if (naIsNum(lat) && naIsNum(lon)) {
-    result = SGGeod::fromDeg(naNumValue(lat).num, naNumValue(lon).num);
-    return true;
-  }
-  
-// check for geo.Coord type
-    
-// check for any synonyms?
-    // latitude + longitude?
-  
-  return false;
+  if (naGhost_type(r) == &FPLegGhostType)
+    return (FlightPlan::Leg*) naGhost_ptr(r);
+  return 0;
 }
 
-static int geodFromArgs(naRef* args, int offset, int argc, SGGeod& result)
+static Procedure* procedureGhost(naRef r)
 {
-  if (offset >= argc) {
-    return 0;
-  }
-  
-  if (geodFromHash(args[offset], result)) {
-    return 1;
-  }
-  
-  if (((argc - offset) >= 2) && naIsNum(args[offset]) && naIsNum(args[offset + 1])) {
-    double lat = naNumValue(args[0]).num,
-    lon = naNumValue(args[1]).num;
-    result = SGGeod::fromDeg(lon, lat);
-    return 2;
-  }
-  
+  if (naGhost_type(r) == &ProcedureGhostType)
+    return (Procedure*) naGhost_ptr(r);
   return 0;
 }
 
-// Convert a cartesian point to a geodetic lat/lon/altitude.
-static naRef f_carttogeod(naContext c, naRef me, int argc, naRef* args)
+static FlightPlan* flightplanGhost(naRef r)
 {
-  double lat, lon, alt, xyz[3];
-  if(argc != 3) naRuntimeError(c, "carttogeod() expects 3 arguments");
-  for(int i=0; i<3; i++)
-    xyz[i] = naNumValue(args[i]).num;
-  sgCartToGeod(xyz, &lat, &lon, &alt);
-  lat *= SG_RADIANS_TO_DEGREES;
-  lon *= SG_RADIANS_TO_DEGREES;
-  naRef vec = naNewVector(c);
-  naVec_append(vec, naNum(lat));
-  naVec_append(vec, naNum(lon));
-  naVec_append(vec, naNum(alt));
-  return vec;
+  if (naGhost_type(r) == &FlightPlanGhostType)
+    return (FlightPlan*) naGhost_ptr(r);
+  return 0;
 }
 
-// Convert a geodetic lat/lon/altitude to a cartesian point.
-static naRef f_geodtocart(naContext c, naRef me, int argc, naRef* args)
+static void routeBaseGhostDestroy(void* g)
 {
-  if(argc != 3) naRuntimeError(c, "geodtocart() expects 3 arguments");
-  double lat = naNumValue(args[0]).num * SG_DEGREES_TO_RADIANS;
-  double lon = naNumValue(args[1]).num * SG_DEGREES_TO_RADIANS;
-  double alt = naNumValue(args[2]).num;
-  double xyz[3];
-  sgGeodToCart(lat, lon, alt, xyz);
-  naRef vec = naNewVector(c);
-  naVec_append(vec, naNum(xyz[0]));
-  naVec_append(vec, naNum(xyz[1]));
-  naVec_append(vec, naNum(xyz[2]));
-  return vec;
+  // nothing for now
 }
 
-// For given geodetic point return array with elevation, and a material data
-// hash, or nil if there's no information available (tile not loaded). If
-// information about the material isn't available, then nil is returned instead
-// of the hash.
-static naRef f_geodinfo(naContext c, naRef me, int argc, naRef* args)
+static naRef airportPrototype;
+static naRef flightplanPrototype;
+static naRef waypointPrototype;
+static naRef geoCoordClass;
+static naRef fpLegPrototype;
+static naRef procedurePrototype;
+
+naRef ghostForAirport(naContext c, const FGAirport* apt)
 {
-#define HASHSET(s,l,n) naHash_set(matdata, naStr_fromdata(naNewString(c),s,l),n)
-  if(argc < 2 || argc > 3)
-    naRuntimeError(c, "geodinfo() expects 2 or 3 arguments: lat, lon [, maxalt]");
-  double lat = naNumValue(args[0]).num;
-  double lon = naNumValue(args[1]).num;
-  double elev = argc == 3 ? naNumValue(args[2]).num : 10000;
-  const SGMaterial *mat;
-  SGGeod geod = SGGeod::fromDegM(lon, lat, elev);
-  if(!globals->get_scenery()->get_elevation_m(geod, elev, &mat))
+  if (!apt) {
     return naNil();
-  naRef vec = naNewVector(c);
-  naVec_append(vec, naNum(elev));
-  naRef matdata = naNil();
-  if(mat) {
-    matdata = naNewHash(c);
-    naRef names = naNewVector(c);
-    BOOST_FOREACH(const std::string& n, mat->get_names())
-      naVec_append(names, stringToNasal(c, n));
-      
-    HASHSET("names", 5, names);
-    HASHSET("solid", 5, naNum(mat->get_solid()));
-    HASHSET("friction_factor", 15, naNum(mat->get_friction_factor()));
-    HASHSET("rolling_friction", 16, naNum(mat->get_rolling_friction()));
-    HASHSET("load_resistance", 15, naNum(mat->get_load_resistance()));
-    HASHSET("bumpiness", 9, naNum(mat->get_bumpiness()));
-    HASHSET("light_coverage", 14, naNum(mat->get_light_coverage()));
   }
-  naVec_append(vec, matdata);
-  return vec;
-#undef HASHSET
+  
+  FGPositioned::get(apt); // take a ref
+  return naNewGhost2(c, &AirportGhostType, (void*) apt);
 }
 
-
-class AirportInfoFilter : public FGAirport::AirportFilter
+naRef ghostForNavaid(naContext c, const FGNavRecord* n)
 {
-public:
-  AirportInfoFilter() : type(FGPositioned::AIRPORT) {
+  if (!n) {
+    return naNil();
   }
   
-  bool fromArg(naRef arg)
-  {
-    const char *s = naStr_data(arg);
-    if(!strcmp(s, "airport")) type = FGPositioned::AIRPORT;
-    else if(!strcmp(s, "seaport")) type = FGPositioned::SEAPORT;
-    else if(!strcmp(s, "heliport")) type = FGPositioned::HELIPORT;
-    else
-      return false;
-    
-    return true;
+  FGPositioned::get(n); // take a ref
+  return naNewGhost2(c, &NavaidGhostType, (void*) n);
+}
+
+naRef ghostForRunway(naContext c, const FGRunway* r)
+{
+  if (!r) {
+    return naNil();
   }
   
-  virtual FGPositioned::Type minType() const {
-    return type;
+  FGPositioned::get(r); // take a ref
+  return naNewGhost2(c, &RunwayGhostType, (void*) r);
+}
+
+naRef ghostForHelipad(naContext c, const FGHelipad* r)
+{
+  if (!r) {
+    return naNil();
   }
-  
-  virtual FGPositioned::Type maxType() const {
-    return type;
+
+  FGPositioned::get(r); // take a ref
+  return naNewGhost2(c, &HelipadGhostType, (void*) r);
+}
+
+naRef ghostForTaxiway(naContext c, const FGTaxiway* r)
+{
+  if (!r) {
+    return naNil();
   }
   
-  FGPositioned::Type type;
-};
+  FGPositioned::get(r); // take a ref
+  return naNewGhost2(c, &TaxiwayGhostType, (void*) r);
+}
 
-// Returns data hash for particular or nearest airport of a <type>, or nil
-// on error.
-//
-// airportinfo(<id>);                   e.g. "KSFO"
-// airportinfo(<type>);                 type := ("airport"|"seaport"|"heliport")
-// airportinfo()                        same as  airportinfo("airport")
-// airportinfo(<lat>, <lon> [, <type>]);
-static naRef f_airportinfo(naContext c, naRef me, int argc, naRef* args)
+naRef ghostForFix(naContext c, const FGFix* r)
 {
-  SGGeod pos = globals->get_aircraft_position();
-  FGAirport* apt = NULL;
-  
-  if(argc >= 2 && naIsNum(args[0]) && naIsNum(args[1])) {
-    pos = SGGeod::fromDeg(args[1].num, args[0].num);
-    args += 2;
-    argc -= 2;
+  if (!r) {
+    return naNil();
   }
   
-  double maxRange = 10000.0; // expose this? or pick a smaller value?
-  
-  AirportInfoFilter filter; // defaults to airports only
-  
-  if(argc == 0) {
-    // fall through and use AIRPORT
-  } else if(argc == 1 && naIsString(args[0])) {
-    if (filter.fromArg(args[0])) {
-      // done!
-    } else {
-      // user provided an <id>, hopefully
-      apt = FGAirport::findByIdent(naStr_data(args[0]));
-      if (!apt) {
-        // return nil here, but don't raise a runtime error; this is a
-        // legitamate way to validate an ICAO code, for example in a
-        // dialog box or similar.
-        return naNil();
-      }
-    }
-  } else {
-    naRuntimeError(c, "airportinfo() with invalid function arguments");
+  FGPositioned::get(r); // take a ref
+  return naNewGhost2(c, &FixGhostType, (void*) r);
+}
+
+
+naRef ghostForWaypt(naContext c, const Waypt* wpt)
+{
+  if (!wpt) {
     return naNil();
   }
-  
-  if(!apt) {
-    apt = FGAirport::findClosest(pos, maxRange, &filter);
-    if(!apt) return naNil();
+
+  Waypt::get(wpt); // take a ref
+  return naNewGhost2(c, &WayptGhostType, (void*) wpt);
+}
+
+naRef ghostForLeg(naContext c, const FlightPlan::Leg* leg)
+{
+  if (!leg) {
+    return naNil();
   }
   
-  return hashForAirport(c, apt);
+  return naNewGhost2(c, &FPLegGhostType, (void*) leg);
 }
 
-static naRef f_findAirportsWithinRange(naContext c, naRef me, int argc, naRef* args)
+naRef ghostForFlightPlan(naContext c, const FlightPlan* fp)
 {
-  int argOffset = 0;
-  SGGeod pos = globals->get_aircraft_position();
-  argOffset += geodFromArgs(args, 0, argc, pos);
+  if (!fp) {
+    return naNil();
+  }
   
-  if (!naIsNum(args[argOffset])) {
-    naRuntimeError(c, "findAirportsWithinRange expected range (in nm) as arg %d", argOffset);
+  return naNewGhost2(c, &FlightPlanGhostType, (void*) fp);
+}
+
+naRef ghostForProcedure(naContext c, const Procedure* proc)
+{
+  if (!proc) {
+    return naNil();
   }
   
-  AirportInfoFilter filter; // defaults to airports only
+  return naNewGhost2(c, &ProcedureGhostType, (void*) proc);
+}
+
+static const char* airportGhostGetMember(naContext c, void* g, naRef field, naRef* out)
+{
+  const char* fieldName = naStr_data(field);
+  FGAirport* apt = (FGAirport*) g;
+  
+  if (!strcmp(fieldName, "parents")) {
+    *out = naNewVector(c);
+    naVec_append(*out, airportPrototype);
+  } else if (!strcmp(fieldName, "id")) *out = stringToNasal(c, apt->ident());
+  else if (!strcmp(fieldName, "name")) *out = stringToNasal(c, apt->name());
+  else if (!strcmp(fieldName, "lat")) *out = naNum(apt->getLatitude());
+  else if (!strcmp(fieldName, "lon")) *out = naNum(apt->getLongitude());
+  else if (!strcmp(fieldName, "elevation")) {
+    *out = naNum(apt->getElevation() * SG_FEET_TO_METER);
+  } else if (!strcmp(fieldName, "has_metar")) {
+    *out = naNum(apt->getMetar());
+  } else if (!strcmp(fieldName, "runways")) {
+    *out = naNewHash(c);
+    double minLengthFt = fgGetDouble("/sim/navdb/min-runway-length-ft");
+    for(unsigned int r=0; r<apt->numRunways(); ++r) {
+      FGRunway* rwy(apt->getRunwayByIndex(r));
+      // ignore unusably short runways
+      if (rwy->lengthFt() < minLengthFt) {
+        continue;
+      }
+      naRef rwyid = stringToNasal(c, rwy->ident());
+      naRef rwydata = ghostForRunway(c, rwy);
+      naHash_set(*out, rwyid, rwydata);
+    }
+  } else if (!strcmp(fieldName, "helipads")) {
+    *out = naNewHash(c);
+
+    for(unsigned int r=0; r<apt->numHelipads(); ++r) {
+      FGHelipad* hp(apt->getHelipadByIndex(r));
+
+      naRef rwyid = stringToNasal(c, hp->ident());
+      naRef rwydata = ghostForHelipad(c, hp);
+      naHash_set(*out, rwyid, rwydata);
+    }
+
+  } else if (!strcmp(fieldName, "taxiways")) {
+    *out = naNewVector(c);
+    for(unsigned int r=0; r<apt->numTaxiways(); ++r) {
+      FGTaxiway* taxi(apt->getTaxiwayByIndex(r));
+      naRef taxidata = ghostForTaxiway(c, taxi);
+      naVec_append(*out, taxidata);
+    }
+
+  } else {
+    return 0;
+  }
+  
+  return "";
+}
+
+static const char* waypointCommonGetMember(naContext c, Waypt* wpt, const char* fieldName, naRef* out)
+{
+  if (!strcmp(fieldName, "wp_name") || !strcmp(fieldName, "id")) *out = stringToNasal(c, wpt->ident());
+  else if (!strcmp(fieldName, "wp_type")) *out = stringToNasal(c, wpt->type());
+  else if (!strcmp(fieldName, "wp_role")) *out = wayptFlagToNasal(c, wpt->flags());
+  else if (!strcmp(fieldName, "wp_lat") || !strcmp(fieldName, "lat")) *out = naNum(wpt->position().getLatitudeDeg());
+  else if (!strcmp(fieldName, "wp_lon") || !strcmp(fieldName, "lon")) *out = naNum(wpt->position().getLongitudeDeg());
+  else if (!strcmp(fieldName, "wp_parent_name")) {
+    Procedure* proc = dynamic_cast<Procedure*>(wpt->owner());
+    *out = proc ? stringToNasal(c, proc->ident()) : naNil();
+  } else if (!strcmp(fieldName, "wp_parent")) {
+    Procedure* proc = dynamic_cast<Procedure*>(wpt->owner());
+    *out = ghostForProcedure(c, proc);
+  } else if (!strcmp(fieldName, "fly_type")) {
+    if (wpt->type() == "hold") {
+      *out = stringToNasal(c, "Hold");
+    } else {
+      *out = stringToNasal(c, wpt->flag(WPT_OVERFLIGHT) ? "flyOver" : "flyBy");
+    }
+  } else {
+    return NULL; // member not found
+  }
+
+  return "";
+}
+
+static void waypointCommonSetMember(naContext c, Waypt* wpt, const char* fieldName, naRef value)
+{
+  if (!strcmp(fieldName, "wp_role")) {
+    if (!naIsString(value)) naRuntimeError(c, "wp_role must be a string");
+    if (wpt->owner() != NULL) naRuntimeError(c, "cannot override wp_role on waypoint with parent");
+    WayptFlag f = wayptFlagFromString(naStr_data(value));
+    if (f == 0) {
+      naRuntimeError(c, "unrecognized wp_role value %s", naStr_data(value));
+    }
+    
+    wpt->setFlag(f, true);
+  }
+}
+
+static const char* wayptGhostGetMember(naContext c, void* g, naRef field, naRef* out)
+{
+  const char* fieldName = naStr_data(field);
+  Waypt* wpt = (flightgear::Waypt*) g;
+  return waypointCommonGetMember(c, wpt, fieldName, out);
+}
+
+static RouteRestriction routeRestrictionFromString(const char* s)
+{
+  std::string u(s);
+  boost::to_lower(u);
+  if (u == "computed") return RESTRICT_COMPUTED;
+  if (u == "at") return RESTRICT_AT;
+  if (u == "mach") return SPEED_RESTRICT_MACH;
+  if (u == "computed-mach") return SPEED_COMPUTED_MACH;
+  if (u == "delete") return RESTRICT_DELETE;
+  return RESTRICT_NONE;
+};
+
+naRef routeRestrictionToNasal(naContext c, RouteRestriction rr)
+{
+  switch (rr) {
+    case RESTRICT_NONE: return naNil();
+    case RESTRICT_AT: return stringToNasal(c, "at");
+    case RESTRICT_ABOVE: return stringToNasal(c, "above");
+    case RESTRICT_BELOW: return stringToNasal(c, "below");
+    case SPEED_RESTRICT_MACH: return stringToNasal(c, "mach");
+    case RESTRICT_COMPUTED: return stringToNasal(c, "computed");
+    case SPEED_COMPUTED_MACH: return stringToNasal(c, "computed-mach");
+    case RESTRICT_DELETE: return stringToNasal(c, "delete");
+  }
+  
+  return naNil();
+}
+
+static const char* legGhostGetMember(naContext c, void* g, naRef field, naRef* out)
+{
+  const char* fieldName = naStr_data(field);
+  FlightPlan::Leg* leg = (FlightPlan::Leg*) g;
+  Waypt* wpt = leg->waypoint();
+  
+  if (!strcmp(fieldName, "parents")) {
+    *out = naNewVector(c);
+    naVec_append(*out, fpLegPrototype);
+    naVec_append(*out, waypointPrototype);
+  } else if (!strcmp(fieldName, "index")) {
+    *out = naNum(leg->index());
+  } else if (!strcmp(fieldName, "alt_cstr")) {
+    *out = naNum(leg->altitudeFt());
+  } else if (!strcmp(fieldName, "alt_cstr_type")) {
+    *out = routeRestrictionToNasal(c, leg->altitudeRestriction());
+  } else if (!strcmp(fieldName, "speed_cstr")) {
+    double s = isMachRestrict(leg->speedRestriction()) ? leg->speedMach() : leg->speedKts();
+    *out = naNum(s);
+  } else if (!strcmp(fieldName, "speed_cstr_type")) {
+    *out = routeRestrictionToNasal(c, leg->speedRestriction());  
+  } else if (!strcmp(fieldName, "leg_distance")) {
+    *out = naNum(leg->distanceNm());
+  } else if (!strcmp(fieldName, "leg_bearing")) {
+    *out = naNum(leg->courseDeg());
+  } else if (!strcmp(fieldName, "distance_along_route")) {
+    *out = naNum(leg->distanceAlongRoute());
+  } else { // check for fields defined on the underlying waypoint
+    return waypointCommonGetMember(c, wpt, fieldName, out);
+  }
+  
+  return ""; // success
+}
+
+static void waypointGhostSetMember(naContext c, void* g, naRef field, naRef value)
+{
+  const char* fieldName = naStr_data(field);
+  Waypt* wpt = (Waypt*) g;
+  waypointCommonSetMember(c, wpt, fieldName, value);
+}
+
+static void legGhostSetMember(naContext c, void* g, naRef field, naRef value)
+{
+  const char* fieldName = naStr_data(field);
+  FlightPlan::Leg* leg = (FlightPlan::Leg*) g;
+    
+  waypointCommonSetMember(c, leg->waypoint(), fieldName, value);
+}
+
+static const char* flightplanGhostGetMember(naContext c, void* g, naRef field, naRef* out)
+{
+  const char* fieldName = naStr_data(field);
+  FlightPlan* fp = (FlightPlan*) g;
+  
+  if (!strcmp(fieldName, "parents")) {
+    *out = naNewVector(c);
+    naVec_append(*out, flightplanPrototype);
+  } else if (!strcmp(fieldName, "id")) *out = stringToNasal(c, fp->ident());
+  else if (!strcmp(fieldName, "departure")) *out = ghostForAirport(c, fp->departureAirport());
+  else if (!strcmp(fieldName, "destination")) *out = ghostForAirport(c, fp->destinationAirport());
+  else if (!strcmp(fieldName, "departure_runway")) *out = ghostForRunway(c, fp->departureRunway());
+  else if (!strcmp(fieldName, "destination_runway")) *out = ghostForRunway(c, fp->destinationRunway());
+  else if (!strcmp(fieldName, "sid")) *out = ghostForProcedure(c, fp->sid());
+  else if (!strcmp(fieldName, "sid_trans")) *out = ghostForProcedure(c, fp->sidTransition());
+  else if (!strcmp(fieldName, "star")) *out = ghostForProcedure(c, fp->star());
+  else if (!strcmp(fieldName, "star_trans")) *out = ghostForProcedure(c, fp->starTransition());
+  else if (!strcmp(fieldName, "approach")) *out = ghostForProcedure(c, fp->approach());
+  else if (!strcmp(fieldName, "current")) *out = naNum(fp->currentIndex());
+  else {
+    return 0;
+  }
+  
+  return "";
+}
+
+static void flightplanGhostSetMember(naContext c, void* g, naRef field, naRef value)
+{
+  const char* fieldName = naStr_data(field);
+  FlightPlan* fp = (FlightPlan*) g;
+  
+  if (!strcmp(fieldName, "id")) {
+    if (!naIsString(value)) naRuntimeError(c, "flightplan.id must be a string");
+    fp->setIdent(naStr_data(value));
+  } else if (!strcmp(fieldName, "current")) {
+    int index = value.num;
+    if ((index < 0) || (index >= fp->numLegs())) {
+      return;
+    }
+    fp->setCurrentIndex(index);
+  } else if (!strcmp(fieldName, "departure")) {
+    FGAirport* apt = airportGhost(value);
+    if (apt) {
+      fp->setDeparture(apt);
+      return;
+    }
+    
+    FGRunway* rwy = runwayGhost(value);
+    if (rwy){
+      fp->setDeparture(rwy);
+      return;
+    }
+    
+    if (naIsNil(value)) {
+      fp->setDeparture(static_cast<FGAirport*>(NULL));
+      return;
+    }
+      
+    naRuntimeError(c, "bad argument type setting departure");
+  } else if (!strcmp(fieldName, "destination")) {
+    FGAirport* apt = airportGhost(value);
+    if (apt) {
+      fp->setDestination(apt);
+      return;
+    }
+    
+    FGRunway* rwy = runwayGhost(value);
+    if (rwy){
+      fp->setDestination(rwy);
+      return;
+    }
+    
+    naRuntimeError(c, "bad argument type setting destination");
+  } else if (!strcmp(fieldName, "departure_runway")) {
+    FGRunway* rwy = runwayGhost(value);
+    if (rwy){
+      fp->setDeparture(rwy);
+      return;
+    }
+    
+    naRuntimeError(c, "bad argument type setting departure runway");
+  } else if (!strcmp(fieldName, "destination_runway")) {
+    FGRunway* rwy = runwayGhost(value);
+    if (rwy){
+      fp->setDestination(rwy);
+      return;
+    }
+    
+    naRuntimeError(c, "bad argument type setting destination runway");
+  } else if (!strcmp(fieldName, "sid")) {
+    Procedure* proc = procedureGhost(value);
+    if (proc && (proc->type() == PROCEDURE_SID)) {
+      fp->setSID((flightgear::SID*) proc);
+      return;
+    }
+    // allow a SID transition to be set, implicitly include the SID itself
+    if (proc && (proc->type() == PROCEDURE_TRANSITION)) {
+      fp->setSID((Transition*) proc);
+      return;
+    }
+        
+    if (naIsString(value)) {
+      FGAirport* apt = fp->departureAirport();
+      fp->setSID(apt->findSIDWithIdent(naStr_data(value)));
+      return;
+    }
+    
+    naRuntimeError(c, "bad argument type setting SID");
+  } else if (!strcmp(fieldName, "star")) {
+    Procedure* proc = procedureGhost(value);
+    if (proc && (proc->type() == PROCEDURE_STAR)) {
+      fp->setSTAR((STAR*) proc);
+      return;
+    }
+    
+    if (proc && (proc->type() == PROCEDURE_TRANSITION)) {
+      fp->setSTAR((Transition*) proc);
+      return;
+    }
+    
+    if (naIsString(value)) {
+      FGAirport* apt = fp->destinationAirport();
+      fp->setSTAR(apt->findSTARWithIdent(naStr_data(value)));
+      return;
+    }
+    
+    naRuntimeError(c, "bad argument type setting STAR");
+  } else if (!strcmp(fieldName, "approach")) {
+    Procedure* proc = procedureGhost(value);
+    if (proc && Approach::isApproach(proc->type())) {
+      fp->setApproach((Approach*) proc);
+      return;
+    }
+    
+    if (naIsString(value)) {
+      FGAirport* apt = fp->destinationAirport();
+      fp->setApproach(apt->findApproachWithIdent(naStr_data(value)));
+      return;
+    }
+    
+    naRuntimeError(c, "bad argument type setting approach");
+  }
+}
+
+
+static naRef procedureTpType(naContext c, ProcedureType ty)
+{
+  switch (ty) {
+    case PROCEDURE_SID: return stringToNasal(c, "sid");
+    case PROCEDURE_STAR: return stringToNasal(c, "star");
+    case PROCEDURE_APPROACH_VOR: 
+    case PROCEDURE_APPROACH_ILS: 
+    case PROCEDURE_APPROACH_RNAV: 
+    case PROCEDURE_APPROACH_NDB:
+      return stringToNasal(c, "IAP");
+    default:
+      return naNil();
+  }
+}
+
+static naRef procedureRadioType(naContext c, ProcedureType ty)
+{
+  switch (ty) {
+    case PROCEDURE_APPROACH_VOR: return stringToNasal(c, "VOR");
+    case PROCEDURE_APPROACH_ILS: return stringToNasal(c, "ILS");
+    case PROCEDURE_APPROACH_RNAV: return stringToNasal(c, "RNAV");
+    case PROCEDURE_APPROACH_NDB: return stringToNasal(c, "NDB");
+    default:
+      return naNil();
+  }
+}
+
+static const char* procedureGhostGetMember(naContext c, void* g, naRef field, naRef* out)
+{
+  const char* fieldName = naStr_data(field);
+  Procedure* proc = (Procedure*) g;
+  
+  if (!strcmp(fieldName, "parents")) {
+    *out = naNewVector(c);
+    naVec_append(*out, procedurePrototype);
+  } else if (!strcmp(fieldName, "id")) *out = stringToNasal(c, proc->ident());
+  else if (!strcmp(fieldName, "airport")) *out = ghostForAirport(c, proc->airport());
+  else if (!strcmp(fieldName, "tp_type")) *out = procedureTpType(c, proc->type());
+  else if (!strcmp(fieldName, "radio")) *out = procedureRadioType(c, proc->type());
+  else if (!strcmp(fieldName, "runways")) {
+    *out = naNewVector(c);
+    BOOST_FOREACH(FGRunwayRef rwy, proc->runways()) {
+      naVec_append(*out, stringToNasal(c, rwy->ident()));
+    }
+  } else if (!strcmp(fieldName, "transitions")) {
+    if ((proc->type() != PROCEDURE_SID) && (proc->type() != PROCEDURE_STAR)) {
+      *out = naNil();
+      return "";
+    }
+        
+    ArrivalDeparture* ad = static_cast<ArrivalDeparture*>(proc);
+    *out = naNewVector(c);
+    BOOST_FOREACH(std::string id, ad->transitionIdents()) {
+      naVec_append(*out, stringToNasal(c, id));
+    }
+  } else {
+    return 0;
+  }
+  
+  return "";
+}
+
+static const char* runwayGhostGetMember(naContext c, void* g, naRef field, naRef* out)
+{
+  const char* fieldName = naStr_data(field);
+  FGRunwayBase* base = (FGRunwayBase*) g;
+  
+  if (!strcmp(fieldName, "id")) *out = stringToNasal(c, base->ident());
+  else if (!strcmp(fieldName, "lat")) *out = naNum(base->latitude());
+  else if (!strcmp(fieldName, "lon")) *out = naNum(base->longitude());
+  else if (!strcmp(fieldName, "heading")) *out = naNum(base->headingDeg());
+  else if (!strcmp(fieldName, "length")) *out = naNum(base->lengthM());
+  else if (!strcmp(fieldName, "width")) *out = naNum(base->widthM());
+  else if (!strcmp(fieldName, "surface")) *out = naNum(base->surface());
+  else if (base->type() == FGRunwayBase::RUNWAY) {  
+    FGRunway* rwy = (FGRunway*) g;
+    if (!strcmp(fieldName, "threshold")) *out = naNum(rwy->displacedThresholdM());
+    else if (!strcmp(fieldName, "stopway")) *out = naNum(rwy->stopwayM());
+    else if (!strcmp(fieldName, "reciprocal")) {
+      *out = ghostForRunway(c, rwy->reciprocalRunway());
+    } else if (!strcmp(fieldName, "ils_frequency_mhz")) {
+      *out = rwy->ILS() ? naNum(rwy->ILS()->get_freq() / 100.0) : naNil();
+    } else if (!strcmp(fieldName, "ils")) {
+      *out = ghostForNavaid(c, rwy->ILS());
+    } else {
+      return 0;
+    }
+  } else {
+    return 0;    
+  }
+  
+  return "";
+}
+
+static const char* navaidGhostGetMember(naContext c, void* g, naRef field, naRef* out)
+{
+  const char* fieldName = naStr_data(field);
+  FGNavRecord* nav = (FGNavRecord*) g;
+  
+  if (!strcmp(fieldName, "id")) *out = stringToNasal(c, nav->ident());
+  else if (!strcmp(fieldName, "name")) *out = stringToNasal(c, nav->name());
+  else if (!strcmp(fieldName, "lat")) *out = naNum(nav->get_lat());
+  else if (!strcmp(fieldName, "lon")) *out = naNum(nav->get_lon());
+  else if (!strcmp(fieldName, "elevation")) {
+    *out = naNum(nav->get_elev_ft() * SG_FEET_TO_METER);
+  } else if (!strcmp(fieldName, "type")) {
+    *out = stringToNasal(c, nav->nameForType(nav->type()));
+  } else if (!strcmp(fieldName, "frequency")) {
+    *out = naNum(nav->get_freq()); 
+  } else if (!strcmp(fieldName, "range_nm")) {
+    *out = naNum(nav->get_range()); 
+  } else if (!strcmp(fieldName, "course")) {
+    if ((nav->type() == FGPositioned::ILS) || (nav->type() == FGPositioned::LOC)) {
+      double radial = nav->get_multiuse();
+      SG_NORMALIZE_RANGE(radial, 0.0, 360.0);
+      *out = naNum(radial);
+    } else {
+      *out = naNil();
+    }
+  } else {
+    return 0;
+  }
+  
+  return "";
+}
+
+static const char* fixGhostGetMember(naContext c, void* g, naRef field, naRef* out)
+{
+  const char* fieldName = naStr_data(field);
+  FGFix* fix = (FGFix*) g;
+  
+  if (!strcmp(fieldName, "id")) *out = stringToNasal(c, fix->ident());
+  else if (!strcmp(fieldName, "lat")) *out = naNum(fix->get_lat());
+  else if (!strcmp(fieldName, "lon")) *out = naNum(fix->get_lon());
+  else {
+    return 0;
+  }
+  
+  return "";
+}
+
+static bool hashIsCoord(naRef h)
+{
+  naRef parents = naHash_cget(h, (char*) "parents");
+  if (!naIsVector(parents)) {
+    return false;
+  }
+  
+  return naEqual(naVec_get(parents, 0), geoCoordClass) != 0;
+}
+
+bool geodFromHash(naRef ref, SGGeod& result)
+{
+  if (!naIsHash(ref)) {
+    return false;
+  }
+
+  
+// check for manual latitude / longitude names
+  naRef lat = naHash_cget(ref, (char*) "lat");
+  naRef lon = naHash_cget(ref, (char*) "lon");
+  if (naIsNum(lat) && naIsNum(lon)) {
+    result = SGGeod::fromDeg(naNumValue(lon).num, naNumValue(lat).num);
+    return true;
+  }
+  
+  if (hashIsCoord(ref)) {
+    naRef lat = naHash_cget(ref, (char*) "_lat");
+    naRef lon = naHash_cget(ref, (char*) "_lon");
+    if (naIsNum(lat) && naIsNum(lon)) {
+      result = SGGeod::fromRad(naNumValue(lon).num, naNumValue(lat).num);
+      return true;
+    }
+  }
+    
+// check for any synonyms?
+    // latitude + longitude?
+  
+  return false;
+}
+
+static int geodFromArgs(naRef* args, int offset, int argc, SGGeod& result)
+{
+  if (offset >= argc) {
+    return 0;
+  }
+  
+  if (naIsGhost(args[offset])) {
+    naGhostType* gt = naGhost_type(args[offset]);
+    if (gt == &AirportGhostType) {
+      result = airportGhost(args[offset])->geod();
+      return 1;
+    }
+    
+    if (gt == &NavaidGhostType) {
+      result = navaidGhost(args[offset])->geod();
+      return 1;
+    }
+    
+    if (gt == &RunwayGhostType) {
+      result = runwayGhost(args[offset])->geod();
+      return 1;
+    }
+    
+    if (gt == &TaxiwayGhostType) {
+      result = taxiwayGhost(args[offset])->geod();
+      return 1;
+    }
+    
+    if (gt == &FixGhostType) {
+      result = fixGhost(args[offset])->geod();
+      return 1;
+    }
+    
+    if (gt == &WayptGhostType) {
+      result = wayptGhost(args[offset])->position();
+      return 1;
+    }
+  }
+  
+  if (geodFromHash(args[offset], result)) {
+    return 1;
+  }
+  
+  if (((argc - offset) >= 2) && naIsNum(args[offset]) && naIsNum(args[offset + 1])) {
+    double lat = naNumValue(args[0]).num,
+    lon = naNumValue(args[1]).num;
+    result = SGGeod::fromDeg(lon, lat);
+    return 2;
+  }
+  
+  return 0;
+}
+
+// Convert a cartesian point to a geodetic lat/lon/altitude.
+static naRef f_carttogeod(naContext c, naRef me, int argc, naRef* args)
+{
+  double lat, lon, alt, xyz[3];
+  if(argc != 3) naRuntimeError(c, "carttogeod() expects 3 arguments");
+  for(int i=0; i<3; i++)
+    xyz[i] = naNumValue(args[i]).num;
+  sgCartToGeod(xyz, &lat, &lon, &alt);
+  lat *= SG_RADIANS_TO_DEGREES;
+  lon *= SG_RADIANS_TO_DEGREES;
+  naRef vec = naNewVector(c);
+  naVec_append(vec, naNum(lat));
+  naVec_append(vec, naNum(lon));
+  naVec_append(vec, naNum(alt));
+  return vec;
+}
+
+// Convert a geodetic lat/lon/altitude to a cartesian point.
+static naRef f_geodtocart(naContext c, naRef me, int argc, naRef* args)
+{
+  if(argc != 3) naRuntimeError(c, "geodtocart() expects 3 arguments");
+  double lat = naNumValue(args[0]).num * SG_DEGREES_TO_RADIANS;
+  double lon = naNumValue(args[1]).num * SG_DEGREES_TO_RADIANS;
+  double alt = naNumValue(args[2]).num;
+  double xyz[3];
+  sgGeodToCart(lat, lon, alt, xyz);
+  naRef vec = naNewVector(c);
+  naVec_append(vec, naNum(xyz[0]));
+  naVec_append(vec, naNum(xyz[1]));
+  naVec_append(vec, naNum(xyz[2]));
+  return vec;
+}
+
+// For given geodetic point return array with elevation, and a material data
+// hash, or nil if there's no information available (tile not loaded). If
+// information about the material isn't available, then nil is returned instead
+// of the hash.
+static naRef f_geodinfo(naContext c, naRef me, int argc, naRef* args)
+{
+#define HASHSET(s,l,n) naHash_set(matdata, naStr_fromdata(naNewString(c),s,l),n)
+  if(argc < 2 || argc > 3)
+    naRuntimeError(c, "geodinfo() expects 2 or 3 arguments: lat, lon [, maxalt]");
+  double lat = naNumValue(args[0]).num;
+  double lon = naNumValue(args[1]).num;
+  double elev = argc == 3 ? naNumValue(args[2]).num : 10000;
+  const simgear::BVHMaterial *material;
+  SGGeod geod = SGGeod::fromDegM(lon, lat, elev);
+  if(!globals->get_scenery()->get_elevation_m(geod, elev, &material))
+    return naNil();
+  const SGMaterial *mat = dynamic_cast<const SGMaterial *>(material);
+  naRef vec = naNewVector(c);
+  naVec_append(vec, naNum(elev));
+  naRef matdata = naNil();
+  if(mat) {
+    matdata = naNewHash(c);
+    naRef names = naNewVector(c);
+    BOOST_FOREACH(const std::string& n, mat->get_names())
+      naVec_append(names, stringToNasal(c, n));
+      
+    HASHSET("names", 5, names);
+    HASHSET("solid", 5, naNum(mat->get_solid()));
+    HASHSET("friction_factor", 15, naNum(mat->get_friction_factor()));
+    HASHSET("rolling_friction", 16, naNum(mat->get_rolling_friction()));
+    HASHSET("load_resistance", 15, naNum(mat->get_load_resistance()));
+    HASHSET("bumpiness", 9, naNum(mat->get_bumpiness()));
+    HASHSET("light_coverage", 14, naNum(mat->get_light_coverage()));
+  }
+  naVec_append(vec, matdata);
+  return vec;
+#undef HASHSET
+}
+
+
+// Returns data hash for particular or nearest airport of a <type>, or nil
+// on error.
+//
+// airportinfo(<id>);                   e.g. "KSFO"
+// airportinfo(<type>);                 type := ("airport"|"seaport"|"heliport")
+// airportinfo()                        same as  airportinfo("airport")
+// airportinfo(<lat>, <lon> [, <type>]);
+static naRef f_airportinfo(naContext c, naRef me, int argc, naRef* args)
+{
+  SGGeod pos = globals->get_aircraft_position();
+  FGAirport* apt = NULL;
+  
+  if(argc >= 2 && naIsNum(args[0]) && naIsNum(args[1])) {
+    pos = SGGeod::fromDeg(args[1].num, args[0].num);
+    args += 2;
+    argc -= 2;
+  }
+  
+  double maxRange = 10000.0; // expose this? or pick a smaller value?
+  
+  FGAirport::TypeRunwayFilter filter; // defaults to airports only
+  
+  if(argc == 0) {
+    // fall through and use AIRPORT
+  } else if(argc == 1 && naIsString(args[0])) {
+    if (filter.fromTypeString(naStr_data(args[0]))) {
+      // done!
+    } else {
+      // user provided an <id>, hopefully
+      apt = FGAirport::findByIdent(naStr_data(args[0]));
+      if (!apt) {
+        // return nil here, but don't raise a runtime error; this is a
+        // legitamate way to validate an ICAO code, for example in a
+        // dialog box or similar.
+        return naNil();
+      }
+    }
+  } else {
+    naRuntimeError(c, "airportinfo() with invalid function arguments");
+    return naNil();
+  }
+  
+  if(!apt) {
+    apt = FGAirport::findClosest(pos, maxRange, &filter);
+    if(!apt) return naNil();
+  }
+  
+  return ghostForAirport(c, apt);
+}
+
+static naRef f_findAirportsWithinRange(naContext c, naRef me, int argc, naRef* args)
+{
+  int argOffset = 0;
+  SGGeod pos = globals->get_aircraft_position();
+  argOffset += geodFromArgs(args, 0, argc, pos);
+  
+  if (!naIsNum(args[argOffset])) {
+    naRuntimeError(c, "findAirportsWithinRange expected range (in nm) as arg %d", argOffset);
+  }
+  
+  FGAirport::TypeRunwayFilter filter; // defaults to airports only
+  double rangeNm = args[argOffset++].num;
+  if (argOffset < argc) {
+    filter.fromTypeString(naStr_data(args[argOffset++]));
+  }
+  
+  naRef r = naNewVector(c);
+  
+  FGPositionedList apts = FGPositioned::findWithinRange(pos, rangeNm, &filter);
+  FGPositioned::sortByRange(apts, pos);
+  
+  BOOST_FOREACH(FGPositionedRef a, apts) {
+    FGAirport* apt = (FGAirport*) a.get();
+    naVec_append(r, ghostForAirport(c, apt));
+  }
+  
+  return r;
+}
+
+static naRef f_findAirportsByICAO(naContext c, naRef me, int argc, naRef* args)
+{
+  if (!naIsString(args[0])) {
+    naRuntimeError(c, "findAirportsByICAO expects string as arg 0");
+  }
+  
+  int argOffset = 0;
+  std::string prefix(naStr_data(args[argOffset++]));
+  FGAirport::TypeRunwayFilter filter; // defaults to airports only
+  if (argOffset < argc) {
+    filter.fromTypeString(naStr_data(args[argOffset++]));
+  }
+  
+  naRef r = naNewVector(c);
+  
+  FGPositionedList apts = FGPositioned::findAllWithIdent(prefix, &filter, false);
+  
+  BOOST_FOREACH(FGPositionedRef a, apts) {
+    FGAirport* apt = (FGAirport*) a.get();
+    naVec_append(r, ghostForAirport(c, apt));
+  }
+  
+  return r;
+}
+
+static naRef f_airport_tower(naContext c, naRef me, int argc, naRef* args)
+{
+    FGAirport* apt = airportGhost(me);
+    if (!apt) {
+      naRuntimeError(c, "airport.tower called on non-airport object");
+    }
+  
+    // build a hash for the tower position    
+    SGGeod towerLoc = apt->getTowerLocation();
+    naRef tower = naNewHash(c);
+    hashset(c, tower, "lat", naNum(towerLoc.getLatitudeDeg()));
+    hashset(c, tower, "lon", naNum(towerLoc.getLongitudeDeg()));
+    hashset(c, tower, "elevation", naNum(towerLoc.getElevationM()));
+    return tower;
+}
+
+static naRef f_airport_comms(naContext c, naRef me, int argc, naRef* args)
+{
+    FGAirport* apt = airportGhost(me);
+    if (!apt) {
+      naRuntimeError(c, "airport.comms called on non-airport object");
+    }
+    naRef comms = naNewVector(c);
+    
+// if we have an explicit type, return a simple vector of frequencies
+    if (argc > 0 && !naIsString(args[0])) {
+        naRuntimeError(c, "airport.comms argument must be a frequency type name");
+    }
+    
+    if (argc > 0) {
+        std::string commName = naStr_data(args[0]);
+        FGPositioned::Type commType = FGPositioned::typeFromName(commName);
+        
+        BOOST_FOREACH(flightgear::CommStation* comm, apt->commStationsOfType(commType)) {
+            naVec_append(comms, naNum(comm->freqMHz()));
+        }
+    } else {
+// otherwise return a vector of hashes, one for each comm station.
+        BOOST_FOREACH(flightgear::CommStation* comm, apt->commStations()) {
+            naRef commHash = naNewHash(c);
+            hashset(c, commHash, "frequency", naNum(comm->freqMHz()));
+            hashset(c, commHash, "ident", stringToNasal(c, comm->ident()));
+            naVec_append(comms, commHash);
+        }
+    }
+    
+    return comms;
+}
+
+static naRef f_airport_runway(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.runway called on non-airport object");
+  }
+
+  if ((argc < 1) || !naIsString(args[0])) {
+    naRuntimeError(c, "airport.runway expects a runway ident argument");
+  }
+
+  std::string ident(naStr_data(args[0]));
+  boost::to_upper(ident);
+
+  if (apt->hasRunwayWithIdent(ident)) {
+    return ghostForRunway(c, apt->getRunwayByIdent(ident));
+  } else if (apt->hasHelipadWithIdent(ident)) {
+    return ghostForHelipad(c, apt->getHelipadByIdent(ident));
+  }
+  return naNil();
+}
+
+static naRef f_airport_runwaysWithoutReciprocals(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.runwaysWithoutReciprocals called on non-airport object");
+  }
+
+  FGRunwayList rwylist(apt->getRunwaysWithoutReciprocals());
+  naRef runways = naNewVector(c);
+  for (unsigned int r=0; r<rwylist.size(); ++r) {
+    FGRunway* rwy(rwylist[r]);
+    naVec_append(runways, ghostForRunway(c, apt->getRunwayByIdent(rwy->ident())));
+  }
+  return runways;
+}
+
+static naRef f_airport_sids(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.sids called on non-airport object");
+  }
+  
+  naRef sids = naNewVector(c);
+  
+  FGRunway* rwy = NULL;
+  if (argc > 0 && naIsString(args[0])) {
+    if (!apt->hasRunwayWithIdent(naStr_data(args[0]))) {
+      return naNil();
+    }
+
+    rwy = apt->getRunwayByIdent(naStr_data(args[0]));
+  } else if (argc > 0) {
+    rwy = runwayGhost(args[0]);
+  }
+
+  if (rwy) {
+    BOOST_FOREACH(flightgear::SID* sid, rwy->getSIDs()) {
+      naRef procId = stringToNasal(c, sid->ident());
+      naVec_append(sids, procId);
+    }
+  } else {
+    for (unsigned int s=0; s<apt->numSIDs(); ++s) {
+      flightgear::SID* sid = apt->getSIDByIndex(s);
+      naRef procId = stringToNasal(c, sid->ident());
+      naVec_append(sids, procId);
+    }
+  }
+  
+  return sids;
+}
+
+static naRef f_airport_stars(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.stars called on non-airport object");
+  }
+  
+  naRef stars = naNewVector(c);
+  
+  FGRunway* rwy = NULL;
+  if (argc > 0 && naIsString(args[0])) {
+    if (!apt->hasRunwayWithIdent(naStr_data(args[0]))) {
+      return naNil();
+    }
+        
+    rwy = apt->getRunwayByIdent(naStr_data(args[0]));
+  } else if (argc > 0) {
+    rwy = runwayGhost(args[0]);
+  }
+  
+  if (rwy) {
+    BOOST_FOREACH(flightgear::STAR* s, rwy->getSTARs()) {
+      naRef procId = stringToNasal(c, s->ident());
+      naVec_append(stars, procId);
+    }
+  } else {
+    for (unsigned int s=0; s<apt->numSTARs(); ++s) {
+      flightgear::STAR* star = apt->getSTARByIndex(s);
+      naRef procId = stringToNasal(c, star->ident());
+      naVec_append(stars, procId);
+    }
+  }
+  
+  return stars;
+}
+
+static naRef f_airport_approaches(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.getApproachList called on non-airport object");
+  }
+  
+  naRef approaches = naNewVector(c);
+  
+  ProcedureType ty = PROCEDURE_INVALID;
+  if ((argc > 1) && naIsString(args[1])) {
+    std::string u(naStr_data(args[1]));
+    boost::to_upper(u);
+    if (u == "NDB") ty = PROCEDURE_APPROACH_NDB;
+    if (u == "VOR") ty = PROCEDURE_APPROACH_VOR;
+    if (u == "ILS") ty = PROCEDURE_APPROACH_ILS;
+    if (u == "RNAV") ty = PROCEDURE_APPROACH_RNAV;
+  }
+  
+  FGRunway* rwy = NULL;
+  if (argc > 0 && (rwy = runwayGhost(args[0]))) {
+    // ok
+  } else if (argc > 0 && naIsString(args[0])) {
+    if (!apt->hasRunwayWithIdent(naStr_data(args[0]))) {
+      return naNil();
+    }
+    
+    rwy = apt->getRunwayByIdent(naStr_data(args[0]));
+  }
+  
+  if (rwy) {
+    BOOST_FOREACH(Approach* s, rwy->getApproaches()) {
+      if ((ty != PROCEDURE_INVALID) && (s->type() != ty)) {
+        continue;
+      }
+      
+      naRef procId = stringToNasal(c, s->ident());
+      naVec_append(approaches, procId);
+    }
+  } else {
+    // no runway specified, report them all
+    for (unsigned int s=0; s<apt->numApproaches(); ++s) {
+      Approach* app = apt->getApproachByIndex(s);
+      if ((ty != PROCEDURE_INVALID) && (app->type() != ty)) {
+        continue;
+      }
+      
+      naRef procId = stringToNasal(c, app->ident());
+      naVec_append(approaches, procId);
+    }
+  }
+  
+  return approaches;
+}
+
+static naRef f_airport_parking(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.parking called on non-airport object");
+  }
+  
+  naRef r = naNewVector(c);
+  std::string type;
+  bool onlyAvailable = false;
+  
+  if (argc > 0 && naIsString(args[0])) {
+    type = naStr_data(args[0]);
+  }
+  
+  if ((argc > 1) && naIsNum(args[1])) {
+    onlyAvailable = (args[1].num != 0.0);
+  }
+  
+  FGAirportDynamics* dynamics = apt->getDynamics();
+  PositionedIDVec parkings = flightgear::NavDataCache::instance()->airportItemsOfType(apt->guid(),
+                                                                                      FGPositioned::PARKING);
+  
+  BOOST_FOREACH(PositionedID parking, parkings) {
+    // filter out based on availability and type
+    if (onlyAvailable && !dynamics->isParkingAvailable(parking)) {
+      continue;
+    }
+    
+    FGParking* park = dynamics->getParking(parking);
+    if (!type.empty() && (park->getType() != type)) {
+      continue;
+    }
+    
+    const SGGeod& parkLoc = park->geod();
+    naRef ph = naNewHash(c);
+    hashset(c, ph, "name", stringToNasal(c, park->getName()));
+    hashset(c, ph, "lat", naNum(parkLoc.getLatitudeDeg()));
+    hashset(c, ph, "lon", naNum(parkLoc.getLongitudeDeg()));
+    hashset(c, ph, "elevation", naNum(parkLoc.getElevationM()));
+    naVec_append(r, ph);
+  }
+  
+  return r;
+}
+
+static naRef f_airport_getSid(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.getSid called on non-airport object");
+  }
+  
+  if ((argc != 1) || !naIsString(args[0])) {
+    naRuntimeError(c, "airport.getSid passed invalid argument");
+  }
+  
+  std::string ident = naStr_data(args[0]);
+  return ghostForProcedure(c, apt->findSIDWithIdent(ident));
+}
+
+static naRef f_airport_getStar(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.getStar called on non-airport object");
+  }
+  
+  if ((argc != 1) || !naIsString(args[0])) {
+    naRuntimeError(c, "airport.getStar passed invalid argument");
+  }
+  
+  std::string ident = naStr_data(args[0]);
+  return ghostForProcedure(c, apt->findSTARWithIdent(ident));
+}
+
+static naRef f_airport_getApproach(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.getIAP called on non-airport object");
+  }
+  
+  if ((argc != 1) || !naIsString(args[0])) {
+    naRuntimeError(c, "airport.getIAP passed invalid argument");
+  }
+  
+  std::string ident = naStr_data(args[0]);
+  return ghostForProcedure(c, apt->findApproachWithIdent(ident));
+}
+
+static naRef f_airport_findBestRunway(naContext c, naRef me, int argc, naRef* args)
+{
+    FGAirport* apt = airportGhost(me);
+    if (!apt) {
+        naRuntimeError(c, "findBestRunway called on non-airport object");
+    }
+    
+    SGGeod pos;
+    if (!geodFromArgs(args, 0, argc, pos)) {
+        naRuntimeError(c, "findBestRunway must be passed a position");
+    }
+    
+    return ghostForRunway(c,  apt->findBestRunwayForPos(pos));
+}
+
+static naRef f_airport_toString(naContext c, naRef me, int argc, naRef* args)
+{
+  FGAirport* apt = airportGhost(me);
+  if (!apt) {
+    naRuntimeError(c, "airport.tostring called on non-airport object");
+  }
+  
+  return stringToNasal(c, "an airport " + apt->ident());
+}
+
+// Returns vector of data hash for navaid of a <type>, nil on error
+// navaids sorted by ascending distance 
+// navinfo([<lat>,<lon>],[<type>],[<id>])
+// lat/lon (numeric): use latitude/longitude instead of ac position
+// type:              ("fix"|"vor"|"ndb"|"ils"|"dme"|"tacan"|"any")
+// id:                (partial) id of the fix
+// examples:
+// navinfo("vor")     returns all vors
+// navinfo("HAM")     return all navaids who's name start with "HAM"
+// navinfo("vor", "HAM") return all vor who's name start with "HAM"
+//navinfo(34,48,"vor","HAM") return all vor who's name start with "HAM" 
+//                           sorted by distance relative to lat=34, lon=48
+static naRef f_navinfo(naContext c, naRef me, int argc, naRef* args)
+{
+  SGGeod pos;
+  
+  if(argc >= 2 && naIsNum(args[0]) && naIsNum(args[1])) {
+    pos = SGGeod::fromDeg(args[1].num, args[0].num);
+    args += 2;
+    argc -= 2;
+  } else {
+    pos = globals->get_aircraft_position();
+  }
+  
+  FGPositioned::Type type = FGPositioned::INVALID;
+  nav_list_type navlist;
+  const char * id = "";
+  
+  if(argc > 0 && naIsString(args[0])) {
+    const char *s = naStr_data(args[0]);
+    if(!strcmp(s, "any")) type = FGPositioned::INVALID;
+    else if(!strcmp(s, "fix")) type = FGPositioned::FIX;
+    else if(!strcmp(s, "vor")) type = FGPositioned::VOR;
+    else if(!strcmp(s, "ndb")) type = FGPositioned::NDB;
+    else if(!strcmp(s, "ils")) type = FGPositioned::ILS;
+    else if(!strcmp(s, "dme")) type = FGPositioned::DME;
+    else if(!strcmp(s, "tacan")) type = FGPositioned::TACAN;
+    else id = s; // this is an id
+    ++args;
+    --argc;
+  } 
+  
+  if(argc > 0 && naIsString(args[0])) {
+    if( *id != 0 ) {
+      naRuntimeError(c, "navinfo() called with navaid id");
+      return naNil();
+    }
+    id = naStr_data(args[0]);
+    ++args;
+    --argc;
+  }
+  
+  if( argc > 0 ) {
+    naRuntimeError(c, "navinfo() called with too many arguments");
+    return naNil();
+  }
+  
+  FGNavList::TypeFilter filter(type);
+  navlist = FGNavList::findByIdentAndFreq( pos, id, 0.0, &filter );
+  
+  naRef reply = naNewVector(c);
+  for( nav_list_type::const_iterator it = navlist.begin(); it != navlist.end(); ++it ) {
+    naVec_append( reply, ghostForNavaid(c, *it) );
+  }
+  return reply;
+}
+
+static naRef f_findNavaidsWithinRange(naContext c, naRef me, int argc, naRef* args)
+{
+  int argOffset = 0;
+  SGGeod pos = globals->get_aircraft_position();
+  argOffset += geodFromArgs(args, 0, argc, pos);
+  
+  if (!naIsNum(args[argOffset])) {
+    naRuntimeError(c, "findNavaidsWithinRange expected range (in nm) as arg %d", argOffset);
+  }
+  
+  FGPositioned::Type type = FGPositioned::INVALID;
   double rangeNm = args[argOffset++].num;
   if (argOffset < argc) {
-    filter.fromArg(args[argOffset++]);
+    type = FGPositioned::typeFromName(naStr_data(args[argOffset]));
+  }
+  
+  naRef r = naNewVector(c);
+  FGNavList::TypeFilter filter(type);
+  FGPositionedList navs = FGPositioned::findWithinRange(pos, rangeNm, &filter);
+  FGPositioned::sortByRange(navs, pos);
+  
+  BOOST_FOREACH(FGPositionedRef a, navs) {
+    FGNavRecord* nav = (FGNavRecord*) a.get();
+    naVec_append(r, ghostForNavaid(c, nav));
+  }
+  
+  return r;
+}
+
+static naRef f_findNavaidByFrequency(naContext c, naRef me, int argc, naRef* args)
+{
+  int argOffset = 0;
+  SGGeod pos = globals->get_aircraft_position();
+  argOffset += geodFromArgs(args, 0, argc, pos);
+  
+  if (!naIsNum(args[argOffset])) {
+    naRuntimeError(c, "findNavaidByFrequency expectes frequency (in Mhz) as arg %d", argOffset);
+  }
+  
+  FGPositioned::Type type = FGPositioned::INVALID;
+  double freqMhz = args[argOffset++].num;
+  if (argOffset < argc) {
+    type = FGPositioned::typeFromName(naStr_data(args[argOffset]));
+  }
+  
+  FGNavList::TypeFilter filter(type);
+  nav_list_type navs = FGNavList::findAllByFreq(freqMhz, pos, &filter);
+  if (navs.empty()) {
+    return naNil();
+  }
+  
+  return ghostForNavaid(c, navs.front().ptr());
+}
+
+static naRef f_findNavaidsByFrequency(naContext c, naRef me, int argc, naRef* args)
+{
+  int argOffset = 0;
+  SGGeod pos = globals->get_aircraft_position();
+  argOffset += geodFromArgs(args, 0, argc, pos);
+  
+  if (!naIsNum(args[argOffset])) {
+    naRuntimeError(c, "findNavaidsByFrequency expectes frequency (in Mhz) as arg %d", argOffset);
+  }
+  
+  FGPositioned::Type type = FGPositioned::INVALID;
+  double freqMhz = args[argOffset++].num;
+  if (argOffset < argc) {
+    type = FGPositioned::typeFromName(naStr_data(args[argOffset]));
   }
   
   naRef r = naNewVector(c);
   
-  FGPositioned::List apts = FGPositioned::findWithinRange(pos, rangeNm, &filter);
-  FGPositioned::sortByRange(apts, pos);
+  FGNavList::TypeFilter filter(type);
+  nav_list_type navs = FGNavList::findAllByFreq(freqMhz, pos, &filter);
   
-  BOOST_FOREACH(FGPositionedRef a, apts) {
-    FGAirport* apt = (FGAirport*) a.get();
-    naVec_append(r, hashForAirport(c, apt));
+  BOOST_FOREACH(nav_rec_ptr a, navs) {
+    naVec_append(r, ghostForNavaid(c, a.ptr()));
   }
   
   return r;
 }
 
-static naRef f_findAirportsByICAO(naContext c, naRef me, int argc, naRef* args)
+static naRef f_findNavaidsByIdent(naContext c, naRef me, int argc, naRef* args)
 {
-  if (!naIsString(args[0])) {
-    naRuntimeError(c, "findAirportsByICAO expects string as arg 0");
+  int argOffset = 0;
+  SGGeod pos = globals->get_aircraft_position();
+  argOffset += geodFromArgs(args, 0, argc, pos);
+  
+  if (!naIsString(args[argOffset])) {
+    naRuntimeError(c, "findNavaidsByIdent expectes ident string as arg %d", argOffset);
   }
   
-  int argOffset = 0;
-  string prefix(naStr_data(args[argOffset++]));
-  AirportInfoFilter filter; // defaults to airports only
+  FGPositioned::Type type = FGPositioned::INVALID;
+  std::string ident = naStr_data(args[argOffset++]);
   if (argOffset < argc) {
-    filter.fromArg(args[argOffset++]);
+    type = FGPositioned::typeFromName(naStr_data(args[argOffset]));
   }
   
+  FGNavList::TypeFilter filter(type);
   naRef r = naNewVector(c);
+  nav_list_type navs = FGNavList::findByIdentAndFreq(pos, ident, 0.0, &filter);
   
-  FGPositioned::List apts = FGPositioned::findAllWithIdent(prefix, &filter, false);
-  
-  BOOST_FOREACH(FGPositionedRef a, apts) {
-    FGAirport* apt = (FGAirport*) a.get();
-    naVec_append(r, hashForAirport(c, apt));
+  BOOST_FOREACH(nav_rec_ptr a, navs) {
+    naVec_append(r, ghostForNavaid(c, a.ptr()));
   }
   
   return r;
 }
 
-static FGAirport* airportFromMe(naRef me)
-{  
-    naRef ghost = naHash_cget(me, (char*) "_positioned");
-    if (naIsNil(ghost)) {
-        return NULL;
-    }
+static naRef f_findFixesByIdent(naContext c, naRef me, int argc, naRef* args)
+{
+  int argOffset = 0;
+  SGGeod pos = globals->get_aircraft_position();
+  argOffset += geodFromArgs(args, 0, argc, pos);
   
-    FGPositioned* pos = positionedGhost(ghost);
-    if (pos && FGAirport::isAirportType(pos)) {
-        return (FGAirport*) pos;
-    }
-
-    return NULL;
+  if (!naIsString(args[argOffset])) {
+    naRuntimeError(c, "findFixesByIdent expectes ident string as arg %d", argOffset);
+  }
+  
+  std::string ident(naStr_data(args[argOffset]));
+  naRef r = naNewVector(c);
+  
+  FGPositioned::TypeFilter filter(FGPositioned::FIX);
+  FGPositionedList fixes = FGPositioned::findAllWithIdent(ident, &filter);
+  FGPositioned::sortByRange(fixes, pos);
+  
+  BOOST_FOREACH(FGPositionedRef f, fixes) {
+    naVec_append(r, ghostForFix(c, (FGFix*) f.ptr()));
+  }
+  
+  return r;
 }
 
-static naRef f_airport_tower(naContext c, naRef me, int argc, naRef* args)
+// Convert a cartesian point to a geodetic lat/lon/altitude.
+static naRef f_magvar(naContext c, naRef me, int argc, naRef* args)
 {
-    FGAirport* apt = airportFromMe(me);
-    if (!apt) {
-      naRuntimeError(c, "airport.tower called on non-airport object");
-    }
+  SGGeod pos = globals->get_aircraft_position();
+  if (argc == 0) {
+    // fine, use aircraft position
+  } else if (geodFromArgs(args, 0, argc, pos)) {
+    // okay
+  } else {
+    naRuntimeError(c, "magvar() expects no arguments, a positioned hash or lat,lon pair");
+  }
   
-    // build a hash for the tower position    
-    SGGeod towerLoc = apt->getTowerLocation();
-    naRef tower = naNewHash(c);
-    hashset(c, tower, "lat", naNum(towerLoc.getLatitudeDeg()));
-    hashset(c, tower, "lon", naNum(towerLoc.getLongitudeDeg()));
-    hashset(c, tower, "elevation", naNum(towerLoc.getElevationM()));
-    return tower;
+  double jd = globals->get_time_params()->getJD();
+  double magvarDeg = sgGetMagVar(pos, jd) * SG_RADIANS_TO_DEGREES;
+  return naNum(magvarDeg);
 }
 
-static naRef f_airport_comms(naContext c, naRef me, int argc, naRef* args)
+static naRef f_courseAndDistance(naContext c, naRef me, int argc, naRef* args)
 {
-    FGAirport* apt = airportFromMe(me);
-    if (!apt) {
-      naRuntimeError(c, "airport.comms called on non-airport object");
-    }
-    naRef comms = naNewVector(c);
-    
-// if we have an explicit type, return a simple vector of frequencies
-    if (argc > 0 && naIsScalar(args[0])) {
-        std::string commName = naStr_data(args[0]);
-        FGPositioned::Type commType = FGPositioned::typeFromName(commName);
-        
-        BOOST_FOREACH(flightgear::CommStation* comm, apt->commStationsOfType(commType)) {
-            naVec_append(comms, naNum(comm->freqMHz()));
-        }
+    SGGeod from = globals->get_aircraft_position(), to, p;
+    int argOffset = geodFromArgs(args, 0, argc, p);
+    if (geodFromArgs(args, argOffset, argc, to)) {
+      from = p; // we parsed both FROM and TO args, so first was from
     } else {
-// otherwise return a vector of hashes, one for each comm station.
-        BOOST_FOREACH(flightgear::CommStation* comm, apt->commStations()) {
-            naRef commHash = naNewHash(c);
-            hashset(c, commHash, "frequency", naNum(comm->freqMHz()));
-            hashset(c, commHash, "ident", stringToNasal(c, comm->ident()));
-            naVec_append(comms, commHash);
-        }
+      to = p; // only parsed one arg, so FROM is current
+    }
+  
+    if (argOffset == 0) {
+        naRuntimeError(c, "invalid arguments to courseAndDistance");
     }
     
-    return comms;
+    double course, course2, d;
+    SGGeodesy::inverse(from, to, course, course2, d);
+    
+    naRef result = naNewVector(c);
+    naVec_append(result, naNum(course));
+    naVec_append(result, naNum(d * SG_METER_TO_NM));
+    return result;
 }
 
-static naRef f_airport_sids(naContext c, naRef me, int argc, naRef* args)
+static naRef f_greatCircleMove(naContext c, naRef me, int argc, naRef* args)
 {
-  FGAirport* apt = airportFromMe(me);
-  if (!apt) {
-    naRuntimeError(c, "airport.sids called on non-airport object");
+  SGGeod from = globals->get_aircraft_position(), to;
+  int argOffset = 0;
+  
+  // complication - don't inerpret two doubles (as the only args)
+  // as a lat,lon pair - only do so if we have at least three args.
+  if (argc > 2) {
+    argOffset = geodFromArgs(args, 0, argc, from);
   }
   
-  naRef sids = naNewVector(c);
+  if ((argOffset + 1) >= argc) {
+    naRuntimeError(c, "isufficent arguments to greatCircleMove");
+  }
   
-  // if we have an explicit type, return a simple vector of frequencies
-  if (argc > 0 && naIsString(args[0])) {
-    if (!apt->hasRunwayWithIdent(naStr_data(args[0]))) {
-      return naNil();
-    }
-
-    FGRunway* rwy = apt->getRunwayByIdent(naStr_data(args[0]));
-    BOOST_FOREACH(flightgear::SID* sid, rwy->getSIDs()) {
-      naRef procId = stringToNasal(c, sid->ident());
-      naVec_append(sids, procId);
-    }
-  } else {
-    for (unsigned int s=0; s<apt->numSIDs(); ++s) {
-      flightgear::SID* sid = apt->getSIDByIndex(s);
-      naRef procId = stringToNasal(c, sid->ident());
-      naVec_append(sids, procId);
-    }
+  if (!naIsNum(args[argOffset]) || !naIsNum(args[argOffset+1])) {
+    naRuntimeError(c, "invalid arguments %d and %d to greatCircleMove",
+                   argOffset, argOffset + 1);
   }
   
-  return sids;
+  double course = args[argOffset].num, course2;
+  double distanceNm = args[argOffset + 1].num;
+  SGGeodesy::direct(from, course, distanceNm * SG_NM_TO_METER, to, course2);
+  
+  // return geo.Coord
+  naRef coord = naNewHash(c);
+  hashset(c, coord, "lat", naNum(to.getLatitudeDeg()));
+  hashset(c, coord, "lon", naNum(to.getLongitudeDeg()));
+  return coord;
 }
 
-static naRef f_airport_stars(naContext c, naRef me, int argc, naRef* args)
+static naRef f_tilePath(naContext c, naRef me, int argc, naRef* args)
 {
-  FGAirport* apt = airportFromMe(me);
-  if (!apt) {
-    naRuntimeError(c, "airport.stars called on non-airport object");
+    SGGeod pos = globals->get_aircraft_position();
+    geodFromArgs(args, 0, argc, pos);
+    SGBucket b(pos);
+    return stringToNasal(c, b.gen_base_path());
+}
+
+static naRef f_tileIndex(naContext c, naRef me, int argc, naRef* args)
+{
+  SGGeod pos = globals->get_aircraft_position();
+  geodFromArgs(args, 0, argc, pos);
+  SGBucket b(pos);
+  return naNum(b.gen_index());
+}
+
+static naRef f_route(naContext c, naRef me, int argc, naRef* args)
+{
+  if (argc == 0) {
+    FGRouteMgr* rm = static_cast<FGRouteMgr*>(globals->get_subsystem("route-manager"));  
+    return ghostForFlightPlan(c, rm->flightPlan());
   }
   
-  naRef stars = naNewVector(c);
-  
-  // if we have an explicit type, return a simple vector of frequencies
-  if (argc > 0 && naIsString(args[0])) {
-    if (!apt->hasRunwayWithIdent(naStr_data(args[0]))) {
-      return naNil();
-    }
-        
-    FGRunway* rwy = apt->getRunwayByIdent(naStr_data(args[0]));
-    BOOST_FOREACH(flightgear::STAR* s, rwy->getSTARs()) {
-      naRef procId = stringToNasal(c, s->ident());
-      naVec_append(stars, procId);
+  if ((argc > 0) && naIsString(args[0])) {
+    flightgear::FlightPlan* fp = new flightgear::FlightPlan;
+    SGPath path(naStr_data(args[0]));
+    if (!path.exists()) {
+      naRuntimeError(c, "flightplan, no file at path %s", path.c_str());
     }
-  } else {
-    for (unsigned int s=0; s<apt->numSTARs(); ++s) {
-      flightgear::STAR* star = apt->getSTARByIndex(s);
-      naRef procId = stringToNasal(c, star->ident());
-      naVec_append(stars, procId);
+    
+    if (!fp->load(path)) {
+      SG_LOG(SG_NASAL, SG_WARN, "failed to load flight-plan from " << path);
+      delete fp;
+      return naNil();
     }
+    
+    return ghostForFlightPlan(c, fp);
   }
   
-  return stars;
+  naRuntimeError(c, "bad arguments to flightplan()");
+  return naNil();
 }
 
-static naRef f_airport_parking(naContext c, naRef me, int argc, naRef* args)
+class NasalFPDelegate : public FlightPlan::Delegate
 {
-  FGAirport* apt = airportFromMe(me);
-  if (!apt) {
-    naRuntimeError(c, "airport.parking called on non-airport object");
+public:
+  NasalFPDelegate(FlightPlan* fp, FGNasalSys* sys, naRef ins) :
+    _nasal(sys),
+    _plan(fp),
+    _instance(ins)
+  {
+    _gcSaveKey = _nasal->gcSave(ins);
   }
   
-  naRef r = naNewVector(c);
-  std::string type;
-  bool onlyAvailable = false;
+  virtual ~NasalFPDelegate()
+  {
+    _nasal->gcRelease(_gcSaveKey);
+  }
   
-  if (argc > 0 && naIsString(args[0])) {
-    type = naStr_data(args[0]);
+  virtual void departureChanged()
+  {
+    callDelegateMethod("departureChanged");
   }
   
-  if ((argc > 1) && naIsNum(args[1])) {
-    onlyAvailable = (args[1].num != 0.0);
+  virtual void arrivalChanged()
+  {
+    callDelegateMethod("arrivalChanged");
   }
   
-  FGAirportDynamics* dynamics = apt->getDynamics();
-  for (int i=0; i<dynamics->getNrOfParkings(); ++i) {
-    FGParking* park = dynamics->getParking(i);
-  // filter out based on availability and type
-    if (onlyAvailable && !park->isAvailable()) {
-      continue;
-    }
+  virtual void waypointsChanged()
+  {
+    callDelegateMethod("waypointsChanged");
+  }
+  
+  virtual void currentWaypointChanged()
+  {
+    callDelegateMethod("currentWaypointChanged");
+  }
     
-    if (!type.empty() && (park->getType() != type)) {
-      continue;
+  virtual void cleared()
+  {
+    callDelegateMethod("cleared");
+  }
+    
+  virtual void endOfFlightPlan()
+  {
+    callDelegateMethod("endOfFlightPlan");
+  }
+private:
+  
+  void callDelegateMethod(const char* method)
+  {
+    naRef f;
+    if (naMember_cget(_nasal->context(), _instance, method, &f) == 0) {
+      return; // no method on the delegate
     }
     
-    naRef nm = stringToNasal(c, park->getName());
-    naVec_append(r, nm);
+    naRef arg[1];
+    arg[0] = ghostForFlightPlan(_nasal->context(), _plan);
+    _nasal->callMethod(f, _instance, 1, arg, naNil());
   }
   
-  return r;
-}
+  FGNasalSys* _nasal;
+  FlightPlan* _plan;
+  naRef _instance;
+  int _gcSaveKey;
+};
 
-// Returns vector of data hash for navaid of a <type>, nil on error
-// navaids sorted by ascending distance 
-// navinfo([<lat>,<lon>],[<type>],[<id>])
-// lat/lon (numeric): use latitude/longitude instead of ac position
-// type:              ("fix"|"vor"|"ndb"|"ils"|"dme"|"tacan"|"any")
-// id:                (partial) id of the fix
-// examples:
-// navinfo("vor")     returns all vors
-// navinfo("HAM")     return all navaids who's name start with "HAM"
-// navinfo("vor", "HAM") return all vor who's name start with "HAM"
-//navinfo(34,48,"vor","HAM") return all vor who's name start with "HAM" 
-//                           sorted by distance relative to lat=34, lon=48
-static naRef f_navinfo(naContext c, naRef me, int argc, naRef* args)
+class NasalFPDelegateFactory : public FlightPlan::DelegateFactory
 {
-  SGGeod pos;
-  
-  if(argc >= 2 && naIsNum(args[0]) && naIsNum(args[1])) {
-    pos = SGGeod::fromDeg(args[1].num, args[0].num);
-    args += 2;
-    argc -= 2;
-  } else {
-    pos = globals->get_aircraft_position();
+public:
+  NasalFPDelegateFactory(naRef code)
+  {
+    _nasal = (FGNasalSys*) globals->get_subsystem("nasal");
+    _func = code;
+    _gcSaveKey = _nasal->gcSave(_func);
   }
   
-  FGPositioned::Type type = FGPositioned::INVALID;
-  nav_list_type navlist;
-  const char * id = "";
-  
-  if(argc > 0 && naIsString(args[0])) {
-    const char *s = naStr_data(args[0]);
-    if(!strcmp(s, "any")) type = FGPositioned::INVALID;
-    else if(!strcmp(s, "fix")) type = FGPositioned::FIX;
-    else if(!strcmp(s, "vor")) type = FGPositioned::VOR;
-    else if(!strcmp(s, "ndb")) type = FGPositioned::NDB;
-    else if(!strcmp(s, "ils")) type = FGPositioned::ILS;
-    else if(!strcmp(s, "dme")) type = FGPositioned::DME;
-    else if(!strcmp(s, "tacan")) type = FGPositioned::TACAN;
-    else id = s; // this is an id
-    ++args;
-    --argc;
-  } 
+  ~NasalFPDelegateFactory()
+  {
+    _nasal->gcRelease(_gcSaveKey);
+  }
   
-  if(argc > 0 && naIsString(args[0])) {
-    if( *id != 0 ) {
-      naRuntimeError(c, "navinfo() called with navaid id");
-      return naNil();
+  virtual FlightPlan::Delegate* createFlightPlanDelegate(FlightPlan* fp)
+  {
+    naRef args[1];
+    args[0] = ghostForFlightPlan(_nasal->context(), fp);
+    naRef instance = _nasal->call(_func, 1, args, naNil());
+    if (naIsNil(instance)) {
+      return NULL;
     }
-    id = naStr_data(args[0]);
-    ++args;
-    --argc;
+    
+    return new NasalFPDelegate(fp, _nasal, instance);
   }
-  
-  if( argc > 0 ) {
-    naRuntimeError(c, "navinfo() called with too many arguments");
-    return naNil();
+private:
+  FGNasalSys* _nasal;
+  naRef _func;
+  int _gcSaveKey;
+};
+
+static naRef f_registerFPDelegate(naContext c, naRef me, int argc, naRef* args)
+{
+  if ((argc < 1) || !naIsFunc(args[0])) {
+    naRuntimeError(c, "non-function argument to registerFlightPlanDelegate");
   }
   
-  navlist = globals->get_navlist()->findByIdentAndFreq( pos, id, 0.0, type );
+  NasalFPDelegateFactory* factory = new NasalFPDelegateFactory(args[0]);
+  FlightPlan::registerDelegateFactory(factory);
   
-  naRef reply = naNewVector(c);
-  for( nav_list_type::const_iterator it = navlist.begin(); it != navlist.end(); ++it ) {
-    naVec_append( reply, hashForNavRecord(c, *it, pos) );
-  }
-  return reply;
+  return naNil();
 }
 
-static naRef f_findNavaidsWithinRange(naContext c, naRef me, int argc, naRef* args)
+static WayptRef wayptFromArg(naRef arg)
 {
-  int argOffset = 0;
-  SGGeod pos = globals->get_aircraft_position();
-  argOffset += geodFromArgs(args, 0, argc, pos);
-  
-  if (!naIsNum(args[argOffset])) {
-    naRuntimeError(c, "findNavaidsWithinRange expected range (in nm) as arg %d", argOffset);
+  WayptRef r = wayptGhost(arg);
+  if (r.valid()) {
+    return r;
   }
   
-  FGPositioned::Type type = FGPositioned::INVALID;
-  double rangeNm = args[argOffset++].num;
-  if (argOffset < argc) {
-    type = FGPositioned::typeFromName(naStr_data(args[argOffset]));
+  FGPositioned* pos = positionedGhost(arg);
+  if (!pos) {
+    // let's check if the arg is hash, coudl extra a geod and hence build
+    // a simple waypoint
+    
+    return WayptRef();
   }
   
-  naRef r = naNewVector(c);
-  FGNavList::TypeFilter filter(type);
-  FGPositioned::List navs = FGPositioned::findWithinRange(pos, rangeNm, &filter);
-  FGPositioned::sortByRange(navs, pos);
-  
-  BOOST_FOREACH(FGPositionedRef a, navs) {
-    FGNavRecord* nav = (FGNavRecord*) a.get();
-    naVec_append(r, hashForNavRecord(c, nav, pos));
+// special-case for runways
+  if (pos->type() == FGPositioned::RUNWAY) {
+    return new RunwayWaypt((FGRunway*) pos, NULL);
   }
   
-  return r;
+  return new NavaidWaypoint(pos, NULL);
 }
 
-static naRef f_findNavaidByFrequency(naContext c, naRef me, int argc, naRef* args)
+static naRef convertWayptVecToNasal(naContext c, const WayptVec& wps)
 {
-  int argOffset = 0;
-  SGGeod pos = globals->get_aircraft_position();
-  argOffset += geodFromArgs(args, 0, argc, pos);
+  naRef result = naNewVector(c);
+  BOOST_FOREACH(WayptRef wpt, wps) {
+    naVec_append(result, ghostForWaypt(c, wpt.get()));
+  }
+  return result;
+}
+
+static naRef f_airwaySearch(naContext c, naRef me, int argc, naRef* args)
+{
+  if (argc < 2) {
+    naRuntimeError(c, "airwaysSearch needs at least two arguments");
+  }
   
-  if (!naIsNum(args[argOffset])) {
-    naRuntimeError(c, "findNavaidByFrequency expectes frequency (in Mhz) as arg %d", argOffset);
+  WayptRef start = wayptFromArg(args[0]), 
+    end = wayptFromArg(args[1]);
+  
+  if (!start || !end) {
+    SG_LOG(SG_NASAL, SG_WARN, "airwaysSearch: start or end points are invalid");
+    return naNil();
   }
   
-  FGPositioned::Type type = FGPositioned::INVALID;
-  double freqMhz = args[argOffset++].num;
-  if (argOffset < argc) {
-    type = FGPositioned::typeFromName(naStr_data(args[argOffset]));
+  bool highLevel = true;
+  if ((argc > 2) && naIsString(args[2])) {
+    if (!strcmp(naStr_data(args[2]), "lowlevel")) {
+      highLevel = false;
+    }
   }
   
-  nav_list_type navs = globals->get_navlist()->findAllByFreq(freqMhz, pos, type);
-  if (navs.empty()) {
-    return naNil();
+  WayptVec route;
+  if (highLevel) {
+    Airway::highLevel()->route(start, end, route);
+  } else {
+    Airway::lowLevel()->route(start, end, route);
   }
   
-  return hashForNavRecord(c, navs.front().ptr(), pos);
+  return convertWayptVecToNasal(c, route);
 }
 
-static naRef f_findNavaidsByFrequency(naContext c, naRef me, int argc, naRef* args)
+static naRef f_createWP(naContext c, naRef me, int argc, naRef* args)
 {
-  int argOffset = 0;
-  SGGeod pos = globals->get_aircraft_position();
-  argOffset += geodFromArgs(args, 0, argc, pos);
+  SGGeod pos;
+  int argOffset = geodFromArgs(args, 0, argc, pos);
   
-  if (!naIsNum(args[argOffset])) {
-    naRuntimeError(c, "findNavaidsByFrequency expectes frequency (in Mhz) as arg %d", argOffset);
+  if (((argc - argOffset) < 1) || !naIsString(args[argOffset])) {
+    naRuntimeError(c, "createWP: no identifier supplied");
+  }
+    
+  std::string ident = naStr_data(args[argOffset++]);
+  WayptRef wpt = new BasicWaypt(pos, ident, NULL);
+  
+// set waypt flags - approach, departure, pseudo, etc
+  if (argc > argOffset) {
+    WayptFlag f = wayptFlagFromString(naStr_data(args[argOffset++]));
+    if (f == 0) {
+      naRuntimeError(c, "createWP: bad waypoint role");
+    }
+      
+    wpt->setFlag(f);
   }
   
-  FGPositioned::Type type = FGPositioned::INVALID;
-  double freqMhz = args[argOffset++].num;
-  if (argOffset < argc) {
-    type = FGPositioned::typeFromName(naStr_data(args[argOffset]));
+  return ghostForWaypt(c, wpt);
+}
+
+static naRef f_createWPFrom(naContext c, naRef me, int argc, naRef* args)
+{
+  if (argc < 1) {
+    naRuntimeError(c, "createWPFrom: need at least one argument");
   }
   
-  naRef r = naNewVector(c);
-  nav_list_type navs = globals->get_navlist()->findAllByFreq(freqMhz, pos, type);
+  FGPositioned* positioned = positionedGhost(args[0]);
+  if (!positioned) {
+    naRuntimeError(c, "createWPFrom: couldn;t convert arg[0] to FGPositioned");
+  }
   
-  BOOST_FOREACH(nav_rec_ptr a, navs) {
-    naVec_append(r, hashForNavRecord(c, a.ptr(), pos));
+  WayptRef wpt;
+  if (positioned->type() == FGPositioned::RUNWAY) {
+    wpt = new RunwayWaypt((FGRunway*) positioned, NULL);
+  } else {
+    wpt = new NavaidWaypoint(positioned, NULL);
+  }
+
+  // set waypt flags - approach, departure, pseudo, etc
+  if (argc > 1) {
+    WayptFlag f = wayptFlagFromString(naStr_data(args[1]));
+    if (f == 0) {
+      naRuntimeError(c, "createWPFrom: bad waypoint role");
+    }
+    wpt->setFlag(f);
   }
   
-  return r;
+  return ghostForWaypt(c, wpt);
 }
 
-static naRef f_findNavaidsByIdent(naContext c, naRef me, int argc, naRef* args)
+static naRef f_flightplan_getWP(naContext c, naRef me, int argc, naRef* args)
 {
-  int argOffset = 0;
-  SGGeod pos = globals->get_aircraft_position();
-  argOffset += geodFromArgs(args, 0, argc, pos);
-  
-  if (!naIsString(args[argOffset])) {
-    naRuntimeError(c, "findNavaidsByIdent expectes ident string as arg %d", argOffset);
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.getWP called on non-flightplan object");
   }
-  
-  FGPositioned::Type type = FGPositioned::INVALID;
-  string ident = naStr_data(args[argOffset++]);
-  if (argOffset < argc) {
-    type = FGPositioned::typeFromName(naStr_data(args[argOffset]));
+
+  int index;
+  if (argc == 0) {
+    index = fp->currentIndex();
+  } else {
+    index = (int) naNumValue(args[0]).num;
   }
   
-  naRef r = naNewVector(c);
-  nav_list_type navs = globals->get_navlist()->findByIdentAndFreq(pos, ident, 0.0, type);
-  
-  BOOST_FOREACH(nav_rec_ptr a, navs) {
-    naVec_append(r, hashForNavRecord(c, a.ptr(), pos));
+  if ((index < 0) || (index >= fp->numLegs())) {
+    return naNil();
   }
   
-  return r;
+  return ghostForLeg(c, fp->legAtIndex(index));
+}
+
+static naRef f_flightplan_currentWP(naContext c, naRef me, int argc, naRef* args)
+{
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.currentWP called on non-flightplan object");
+  }
+  return ghostForLeg(c, fp->currentLeg());
 }
 
+static naRef f_flightplan_nextWP(naContext c, naRef me, int argc, naRef* args)
+{
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.nextWP called on non-flightplan object");
+  }
+  return ghostForLeg(c, fp->nextLeg());
+}
 
-// Convert a cartesian point to a geodetic lat/lon/altitude.
-static naRef f_magvar(naContext c, naRef me, int argc, naRef* args)
+static naRef f_flightplan_numWaypoints(naContext c, naRef me, int argc, naRef* args)
 {
-  SGGeod pos = globals->get_aircraft_position();
-  if (argc == 0) {
-    // fine, use aircraft position
-  } else if (geodFromArgs(args, 0, argc, pos)) {
-    // okay
-  } else {
-    naRuntimeError(c, "magvar() expects no arguments, a positioned hash or lat,lon pair");
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.numWaypoints called on non-flightplan object");
+  }
+  return naNum(fp->numLegs());
+}
+
+static naRef f_flightplan_appendWP(naContext c, naRef me, int argc, naRef* args)
+{
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.appendWP called on non-flightplan object");
   }
   
-  double jd = globals->get_time_params()->getJD();
-  double magvarDeg = sgGetMagVar(pos, jd) * SG_RADIANS_TO_DEGREES;
-  return naNum(magvarDeg);
+  WayptRef wp = wayptGhost(args[0]);
+  int index = fp->numLegs();
+  fp->insertWayptAtIndex(wp.get(), index);
+  return naNum(index);
 }
 
-static naRef f_courseAndDistance(naContext c, naRef me, int argc, naRef* args)
+static naRef f_flightplan_insertWP(naContext c, naRef me, int argc, naRef* args)
 {
-    SGGeod from = globals->get_aircraft_position(), to, p;
-    int argOffset = geodFromArgs(args, 0, argc, p);
-    if (geodFromArgs(args, argOffset, argc, to)) {
-      from = p; // we parsed both FROM and TO args, so first was from
-    } else {
-      to = p; // only parsed one arg, so FROM is current
-    }
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.insertWP called on non-flightplan object");
+  }
   
-    if (argOffset == 0) {
-        naRuntimeError(c, "invalid arguments to courseAndDistance");
-    }
-    
-    double course, course2, d;
-    SGGeodesy::inverse(from, to, course, course2, d);
-    
-    naRef result = naNewVector(c);
-    naVec_append(result, naNum(course));
-    naVec_append(result, naNum(d * SG_METER_TO_NM));
-    return result;
+  WayptRef wp = wayptGhost(args[0]);
+  int index = -1; // append
+  if ((argc > 1) && naIsNum(args[1])) {
+    index = (int) args[1].num;
+  }
+  
+  fp->insertWayptAtIndex(wp.get(), index);
+  return naNil();
 }
 
-static naRef f_tilePath(naContext c, naRef me, int argc, naRef* args)
+static naRef f_flightplan_insertWPAfter(naContext c, naRef me, int argc, naRef* args)
 {
-    SGGeod pos = globals->get_aircraft_position();
-    geodFromArgs(args, 0, argc, pos);
-    SGBucket b(pos);
-    return stringToNasal(c, b.gen_base_path());
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.insertWPAfter called on non-flightplan object");
+  }
+  
+  WayptRef wp = wayptGhost(args[0]);
+  int index = -1; // append
+  if ((argc > 1) && naIsNum(args[1])) {
+    index = (int) args[1].num;
+  }
+  
+  fp->insertWayptAtIndex(wp.get(), index + 1);
+  return naNil();
 }
 
-static naRef f_route(naContext c, naRef me, int argc, naRef* args)
+static naRef f_flightplan_insertWaypoints(naContext c, naRef me, int argc, naRef* args)
 {
-  naRef route = naNewHash(c);
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.insertWaypoints called on non-flightplan object");
+  }
+  
+  WayptVec wps;
+  if (!naIsVector(args[0])) {
+    naRuntimeError(c, "flightplan.insertWaypoints expects vector as first arg");
+  }
+
+  int count = naVec_size(args[0]);
+  for (int i=0; i<count; ++i) {
+    Waypt* wp = wayptGhost(naVec_get(args[0], i));
+    if (wp) {
+      wps.push_back(wp);
+    }
+  }
   
-  // return active route hash by default,
-  // other routes in the future
+  int index = -1; // append
+  if ((argc > 1) && naIsNum(args[1])) {
+    index = (int) args[1].num;
+  }
+
+  fp->insertWayptsAtIndex(wps, index);
+  return naNil();
+}
+
+static naRef f_flightplan_deleteWP(naContext c, naRef me, int argc, naRef* args)
+{
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.deleteWP called on non-flightplan object");
+  }
   
-  naRef parents = naNewVector(c);
-  naVec_append(parents, routePrototype);
-  hashset(c, route, "parents", parents);
+  if ((argc < 1) || !naIsNum(args[0])) {
+    naRuntimeError(c, "bad argument to flightplan.deleteWP");
+  }
   
-  return route;
+  int index = (int) args[0].num;
+  fp->deleteIndex(index);
+  return naNil();
 }
 
-static naRef f_route_getWP(naContext c, naRef me, int argc, naRef* args)
+static naRef f_flightplan_clearPlan(naContext c, naRef me, int argc, naRef* args)
 {
-  FGRouteMgr* rm = static_cast<FGRouteMgr*>(globals->get_subsystem("route-manager"));
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.clearPlan called on non-flightplan object");
+  }
   
-  int index;
-  if (argc == 0) {
-    index = rm->currentIndex();
-  } else {
-    index = (int) naNumValue(args[0]).num;
+  fp->clear();
+  return naNil();
+}
+
+static naRef f_flightplan_clearWPType(naContext c, naRef me, int argc, naRef* args)
+{
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.clearWPType called on non-flightplan object");
   }
   
-  if ((index < 0) || (index >= rm->numWaypts())) {
-    return naNil();
+  if (argc < 1) {
+    naRuntimeError(c, "insufficent args to flightplan.clearWPType");
   }
   
-  flightgear::Waypt* next = NULL;
-  if (index < (rm->numWaypts() - 1)) {
-    next = rm->wayptAtIndex(index + 1);
+  WayptFlag flag = wayptFlagFromString(naStr_data(args[0]));
+  if (flag == 0) {
+    naRuntimeError(c, "clearWPType: bad waypoint role");
+  }
+    
+  fp->clearWayptsWithFlag(flag);
+  return naNil();
+}
+
+static naRef f_flightplan_clone(naContext c, naRef me, int argc, naRef* args)
+{
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.clone called on non-flightplan object");
   }
-  return hashForWaypoint(c, rm->wayptAtIndex(index), next);
+  
+  return ghostForFlightPlan(c, fp->clone());
 }
 
-static naRef f_route_currentWP(naContext c, naRef me, int argc, naRef* args)
+static naRef f_flightplan_pathGeod(naContext c, naRef me, int argc, naRef* args)
 {
-  FGRouteMgr* rm = static_cast<FGRouteMgr*>(globals->get_subsystem("route-manager"));
-  flightgear::Waypt* next = NULL;
-  if (rm->currentIndex() < (rm->numWaypts() - 1)) {
-    next = rm->wayptAtIndex(rm->currentIndex() + 1);
+  FlightPlan* fp = flightplanGhost(me);
+  if (!fp) {
+    naRuntimeError(c, "flightplan.clone called on non-flightplan object");
+  }
+
+  if ((argc < 1) || !naIsNum(args[0])) {
+    naRuntimeError(c, "bad argument to flightplan.pathGeod");
+  }
+
+  if ((argc > 1) && !naIsNum(args[1])) {
+    naRuntimeError(c, "bad argument to flightplan.pathGeod");
   }
-  return hashForWaypoint(c, rm->currentWaypt(), next);
+
+  int index = (int) args[0].num;
+  double offset = (argc > 1) ? args[1].num : 0.0;
+  naRef result = naNewHash(c);
+  SGGeod g = fp->pointAlongRoute(index, offset);
+  hashset(c, result, "lat", naNum(g.getLatitudeDeg()));
+  hashset(c, result, "lon", naNum(g.getLongitudeDeg()));
+  return result;
+}
+
+static naRef f_flightplan_finish(naContext c, naRef me, int argc, naRef* args)
+{
+    FlightPlan* fp = flightplanGhost(me);
+    if (!fp) {
+        naRuntimeError(c, "flightplan.finish called on non-flightplan object");
+    }
+    
+    fp->finish();
+    return naNil();
 }
 
-static naRef f_route_currentIndex(naContext c, naRef me, int argc, naRef* args)
+static naRef f_leg_setSpeed(naContext c, naRef me, int argc, naRef* args)
 {
-  FGRouteMgr* rm = static_cast<FGRouteMgr*>(globals->get_subsystem("route-manager"));
-  return naNum(rm->currentIndex());
+  FlightPlan::Leg* leg = fpLegGhost(me);
+  if (!leg) {
+    naRuntimeError(c, "leg.setSpeed called on non-flightplan-leg object");
+  }
+  
+  if (argc < 2) {
+    naRuntimeError(c, "bad arguments to leg.setSpeed");
+  }
+  
+  RouteRestriction rr = routeRestrictionFromString(naStr_data(args[1]));
+  leg->setSpeed(rr, args[0].num);
+  return naNil();
 }
 
-static naRef f_route_numWaypoints(naContext c, naRef me, int argc, naRef* args)
+static naRef f_leg_setAltitude(naContext c, naRef me, int argc, naRef* args)
 {
-  FGRouteMgr* rm = static_cast<FGRouteMgr*>(globals->get_subsystem("route-manager"));
-  return naNum(rm->numWaypts());
+  FlightPlan::Leg* leg = fpLegGhost(me);
+  if (!leg) {
+    naRuntimeError(c, "leg.setAltitude called on non-flightplan-leg object");
+  }
+  
+  if (argc < 2) {
+    naRuntimeError(c, "bad arguments to leg.setAltitude");
+  }
+  
+  RouteRestriction rr = routeRestrictionFromString(naStr_data(args[1]));
+  leg->setAltitude(rr, args[0].num);
+  return naNil();
 }
 
-static flightgear::Waypt* wayptFromMe(naRef me)
-{  
-  naRef ghost = naHash_cget(me, (char*) "_waypt");
-  if (naIsNil(ghost)) {
-    return NULL;
+static naRef f_leg_path(naContext c, naRef me, int argc, naRef* args)
+{
+  FlightPlan::Leg* leg = fpLegGhost(me);
+  if (!leg) {
+    naRuntimeError(c, "leg.setAltitude called on non-flightplan-leg object");
   }
   
-  return wayptGhost(ghost);
+  RoutePath path(leg->owner());
+  SGGeodVec gv(path.pathForIndex(leg->index()));
+
+  naRef result = naNewVector(c);
+  BOOST_FOREACH(SGGeod p, gv) {
+    // construct a geo.Coord!
+    naRef coord = naNewHash(c);
+    hashset(c, coord, "lat", naNum(p.getLatitudeDeg()));
+    hashset(c, coord, "lon", naNum(p.getLongitudeDeg()));
+    naVec_append(result, coord);
+  }
+
+  return result;
+}
+
+static naRef f_leg_courseAndDistanceFrom(naContext c, naRef me, int argc, naRef* args)
+{
+    FlightPlan::Leg* leg = fpLegGhost(me);
+    if (!leg) {
+        naRuntimeError(c, "leg.courseAndDistanceFrom called on non-flightplan-leg object");
+    }
+    
+    SGGeod pos;
+    geodFromArgs(args, 0, argc, pos);
+    
+    double courseDeg;
+    double distanceM;
+    boost::tie(courseDeg, distanceM) = leg->waypoint()->courseAndDistanceFrom(pos);
+    
+    naRef result = naNewVector(c);
+    naVec_append(result, naNum(courseDeg));
+    naVec_append(result, naNum(distanceM * SG_METER_TO_NM));
+    return result;
 }
 
 static naRef f_waypoint_navaid(naContext c, naRef me, int argc, naRef* args)
 {
-  flightgear::Waypt* w = wayptFromMe(me);
+  flightgear::Waypt* w = wayptGhost(me);
   if (!w) {
     naRuntimeError(c, "waypoint.navaid called on non-waypoint object");
   }
@@ -971,7 +2275,7 @@ static naRef f_waypoint_navaid(naContext c, naRef me, int argc, naRef* args)
   case FGPositioned::DME:
   case FGPositioned::TACAN: {
     FGNavRecord* nav = (FGNavRecord*) pos;
-    return hashForNavRecord(c, nav, globals->get_aircraft_position());
+    return ghostForNavaid(c, nav);
   }
       
   default:
@@ -981,7 +2285,7 @@ static naRef f_waypoint_navaid(naContext c, naRef me, int argc, naRef* args)
 
 static naRef f_waypoint_airport(naContext c, naRef me, int argc, naRef* args)
 {
-  flightgear::Waypt* w = wayptFromMe(me);
+  flightgear::Waypt* w = wayptGhost(me);
   if (!w) {
     naRuntimeError(c, "waypoint.navaid called on non-waypoint object");
   }
@@ -991,12 +2295,12 @@ static naRef f_waypoint_airport(naContext c, naRef me, int argc, naRef* args)
     return naNil();
   }
   
-  return hashForAirport(c, (FGAirport*) pos);
+  return ghostForAirport(c, (FGAirport*) pos);
 }
 
 static naRef f_waypoint_runway(naContext c, naRef me, int argc, naRef* args)
 {
-  flightgear::Waypt* w = wayptFromMe(me);
+  flightgear::Waypt* w = wayptGhost(me);
   if (!w) {
     naRuntimeError(c, "waypoint.navaid called on non-waypoint object");
   }
@@ -1006,9 +2310,75 @@ static naRef f_waypoint_runway(naContext c, naRef me, int argc, naRef* args)
     return naNil();
   }
   
-  return hashForRunway(c, (FGRunway*) pos);
+  return ghostForRunway(c, (FGRunway*) pos);
+}
+
+static naRef f_procedure_transition(naContext c, naRef me, int argc, naRef* args)
+{
+  Procedure* proc = procedureGhost(me);
+  if (!proc) {
+    naRuntimeError(c, "procedure.transition called on non-procedure object");
+  }
+  
+  if ((proc->type() != PROCEDURE_SID) && (proc->type() != PROCEDURE_STAR)) {
+    naRuntimeError(c, "procedure.transition called on non-SID or -STAR");
+  }
+  
+  ArrivalDeparture* ad = (ArrivalDeparture*) proc;
+  Transition* trans = ad->findTransitionByName(naStr_data(args[0]));
+  
+  return ghostForProcedure(c, trans);
+}
+
+static naRef f_procedure_route(naContext c, naRef me, int argc, naRef* args)
+{
+  Procedure* proc = procedureGhost(me);
+  if (!proc) {
+    naRuntimeError(c, "procedure.route called on non-procedure object");
+  }
+  
+// wrapping up tow different routines here - approach routing from the IAF
+// to the associated runway, and SID/STAR routing via an enroute transition
+// and possibly a runway transition or not.
+  if (Approach::isApproach(proc->type())) {
+    WayptRef iaf;
+    if (argc > 0) {
+      iaf = wayptFromArg(args[0]);
+    }
+    
+    WayptVec r;
+    Approach* app = (Approach*) proc;
+    if (!app->route(iaf, r)) {
+      SG_LOG(SG_NASAL, SG_WARN, "procedure.route failed for Approach somehow");
+      return naNil();
+    }
+    
+    return convertWayptVecToNasal(c, r);
+  } else if ((proc->type() != PROCEDURE_SID) && (proc->type() != PROCEDURE_STAR)) {
+    naRuntimeError(c, "procedure.route called on unsuitable procedure type");
+  }
+  
+  int argOffset = 0;
+  FGRunway* rwy = runwayGhost(args[0]);
+  if (rwy) ++argOffset;
+  
+  ArrivalDeparture* ad = (ArrivalDeparture*) proc;
+  Transition* trans = NULL;
+  if (argOffset < argc) {
+    trans = (Transition*) procedureGhost(args[argOffset]);
+  }
+  
+  // note either runway or trans may be NULL - that's ok
+  WayptVec r;
+  if (!ad->route(rwy, trans, r)) {
+    SG_LOG(SG_NASAL, SG_WARN, "prcoedure.route failed for ArrvialDeparture somehow");
+    return naNil();
+  }
+  
+  return convertWayptVecToNasal(c, r);
 }
 
+
 // Table of extension functions.  Terminate with zeros.
 static struct { const char* name; naCFunction func; } funcs[] = {
   { "carttogeod", f_carttogeod },
@@ -1022,45 +2392,95 @@ static struct { const char* name; naCFunction func; } funcs[] = {
   { "findNavaidByFrequency", f_findNavaidByFrequency },
   { "findNavaidsByFrequency", f_findNavaidsByFrequency },
   { "findNavaidsByID", f_findNavaidsByIdent },
-  { "route", f_route },
+  { "findFixesByID", f_findFixesByIdent },
+  { "flightplan", f_route },
+  { "registerFlightPlanDelegate", f_registerFPDelegate },
+  { "createWP", f_createWP },
+  { "createWPFrom", f_createWPFrom },
+  { "airwaysRoute", f_airwaySearch },
   { "magvar", f_magvar },
   { "courseAndDistance", f_courseAndDistance },
-  { "bucketPath", f_tilePath },
+  { "greatCircleMove", f_greatCircleMove },
+  { "tileIndex", f_tileIndex },
+  { "tilePath", f_tilePath },
   { 0, 0 }
 };
 
 
-naRef initNasalPositioned(naRef globals, naContext c, naRef gcSave)
+naRef initNasalPositioned(naRef globals, naContext c)
 {
     airportPrototype = naNewHash(c);
-    hashset(c, gcSave, "airportProto", airportPrototype);
+    naSave(c, airportPrototype);
   
+    hashset(c, airportPrototype, "runway", naNewFunc(c, naNewCCode(c, f_airport_runway)));
+    hashset(c, airportPrototype, "runwaysWithoutReciprocals", naNewFunc(c, naNewCCode(c, f_airport_runwaysWithoutReciprocals)));
+    hashset(c, airportPrototype, "helipad", naNewFunc(c, naNewCCode(c, f_airport_runway)));
     hashset(c, airportPrototype, "tower", naNewFunc(c, naNewCCode(c, f_airport_tower)));
     hashset(c, airportPrototype, "comms", naNewFunc(c, naNewCCode(c, f_airport_comms)));
     hashset(c, airportPrototype, "sids", naNewFunc(c, naNewCCode(c, f_airport_sids)));
     hashset(c, airportPrototype, "stars", naNewFunc(c, naNewCCode(c, f_airport_stars)));
+    hashset(c, airportPrototype, "getApproachList", naNewFunc(c, naNewCCode(c, f_airport_approaches)));
     hashset(c, airportPrototype, "parking", naNewFunc(c, naNewCCode(c, f_airport_parking)));
-  
-    routePrototype = naNewHash(c);
-    hashset(c, gcSave, "routeProto", routePrototype);
+    hashset(c, airportPrototype, "getSid", naNewFunc(c, naNewCCode(c, f_airport_getSid)));
+    hashset(c, airportPrototype, "getStar", naNewFunc(c, naNewCCode(c, f_airport_getStar)));
+    hashset(c, airportPrototype, "getIAP", naNewFunc(c, naNewCCode(c, f_airport_getApproach)));
+    hashset(c, airportPrototype, "findBestRunwayForPos", naNewFunc(c, naNewCCode(c, f_airport_findBestRunway)));
+    hashset(c, airportPrototype, "tostring", naNewFunc(c, naNewCCode(c, f_airport_toString)));
+  
+    flightplanPrototype = naNewHash(c);
+    naSave(c, flightplanPrototype);
       
-    hashset(c, routePrototype, "getWP", naNewFunc(c, naNewCCode(c, f_route_getWP)));
-    hashset(c, routePrototype, "currentWP", naNewFunc(c, naNewCCode(c, f_route_currentWP)));
-    hashset(c, routePrototype, "currentIndex", naNewFunc(c, naNewCCode(c, f_route_currentIndex)));
-    hashset(c, routePrototype, "getPlanSize", naNewFunc(c, naNewCCode(c, f_route_numWaypoints)));
+    hashset(c, flightplanPrototype, "getWP", naNewFunc(c, naNewCCode(c, f_flightplan_getWP)));
+    hashset(c, flightplanPrototype, "currentWP", naNewFunc(c, naNewCCode(c, f_flightplan_currentWP))); 
+    hashset(c, flightplanPrototype, "nextWP", naNewFunc(c, naNewCCode(c, f_flightplan_nextWP))); 
+    hashset(c, flightplanPrototype, "getPlanSize", naNewFunc(c, naNewCCode(c, f_flightplan_numWaypoints)));
+    hashset(c, flightplanPrototype, "appendWP", naNewFunc(c, naNewCCode(c, f_flightplan_appendWP))); 
+    hashset(c, flightplanPrototype, "insertWP", naNewFunc(c, naNewCCode(c, f_flightplan_insertWP))); 
+    hashset(c, flightplanPrototype, "deleteWP", naNewFunc(c, naNewCCode(c, f_flightplan_deleteWP))); 
+    hashset(c, flightplanPrototype, "insertWPAfter", naNewFunc(c, naNewCCode(c, f_flightplan_insertWPAfter))); 
+    hashset(c, flightplanPrototype, "insertWaypoints", naNewFunc(c, naNewCCode(c, f_flightplan_insertWaypoints))); 
+    hashset(c, flightplanPrototype, "cleanPlan", naNewFunc(c, naNewCCode(c, f_flightplan_clearPlan))); 
+    hashset(c, flightplanPrototype, "clearWPType", naNewFunc(c, naNewCCode(c, f_flightplan_clearWPType))); 
+    hashset(c, flightplanPrototype, "clone", naNewFunc(c, naNewCCode(c, f_flightplan_clone))); 
+    hashset(c, flightplanPrototype, "pathGeod", naNewFunc(c, naNewCCode(c, f_flightplan_pathGeod)));
+    hashset(c, flightplanPrototype, "finish", naNewFunc(c, naNewCCode(c, f_flightplan_finish)));
     
     waypointPrototype = naNewHash(c);
-    hashset(c, gcSave, "wayptProto", waypointPrototype);
+    naSave(c, waypointPrototype);
     
     hashset(c, waypointPrototype, "navaid", naNewFunc(c, naNewCCode(c, f_waypoint_navaid)));
     hashset(c, waypointPrototype, "runway", naNewFunc(c, naNewCCode(c, f_waypoint_runway)));
     hashset(c, waypointPrototype, "airport", naNewFunc(c, naNewCCode(c, f_waypoint_airport)));
   
+    procedurePrototype = naNewHash(c);
+    naSave(c, procedurePrototype);
+    hashset(c, procedurePrototype, "transition", naNewFunc(c, naNewCCode(c, f_procedure_transition)));
+    hashset(c, procedurePrototype, "route", naNewFunc(c, naNewCCode(c, f_procedure_route)));
+  
+    fpLegPrototype = naNewHash(c);
+    naSave(c, fpLegPrototype);
+    hashset(c, fpLegPrototype, "setSpeed", naNewFunc(c, naNewCCode(c, f_leg_setSpeed)));
+    hashset(c, fpLegPrototype, "setAltitude", naNewFunc(c, naNewCCode(c, f_leg_setAltitude)));
+    hashset(c, fpLegPrototype, "path", naNewFunc(c, naNewCCode(c, f_leg_path)));
+    hashset(c, fpLegPrototype, "courseAndDistanceFrom", naNewFunc(c, naNewCCode(c, f_leg_courseAndDistanceFrom)));
+  
     for(int i=0; funcs[i].name; i++) {
       hashset(c, globals, funcs[i].name,
-            naNewFunc(c, naNewCCode(c, funcs[i].func)));
+      naNewFunc(c, naNewCCode(c, funcs[i].func)));
     }
   
   return naNil();
 }
 
+void postinitNasalPositioned(naRef globals, naContext c)
+{
+  naRef geoModule = naHash_cget(globals, (char*) "geo");
+  if (naIsNil(geoModule)) {
+    SG_LOG(SG_GENERAL, SG_WARN, "postinitNasalPositioned: geo.nas not loaded");
+    return;
+  }
+  
+  geoCoordClass = naHash_cget(geoModule, (char*) "Coord");
+}
+
+