X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FCockpit%2Fradiostack.cxx;h=4a6d38da58f44bffff14f5bdc27f0a378501809c;hb=c0b4531d04215f76f9cf65afbdaed6b7c0b32634;hp=bc41bbb9c4833ff8c0d8d7f85fbaed29beee8d2c;hpb=72a95d570c7e99dce9ea41c64777f6996ad05dfe;p=flightgear.git

diff --git a/src/Cockpit/radiostack.cxx b/src/Cockpit/radiostack.cxx
index bc41bbb9c..4a6d38da5 100644
--- a/src/Cockpit/radiostack.cxx
+++ b/src/Cockpit/radiostack.cxx
@@ -25,6 +25,8 @@
 #  include <config.h>
 #endif
 
+#include <stdio.h>	// snprintf
+
 #include <simgear/compiler.h>
 #include <simgear/math/sg_random.h>
 
@@ -32,1119 +34,100 @@
 #include <Navaids/ilslist.hxx>
 #include <Navaids/mkrbeacons.hxx>
 #include <Navaids/navlist.hxx>
-#include <Time/event.hxx>
 
 #include "radiostack.hxx"
 
-static int nav1_play_count = 0;
-static int nav2_play_count = 0;
-static int adf_play_count = 0;
-static time_t nav1_last_time = 0;
-static time_t nav2_last_time = 0;
-static time_t adf_last_time = 0;
+#include <string>
+SG_USING_STD(string);
 
 
 FGRadioStack *current_radiostack;
 
 
-/**
- * Boy, this is ugly!  Make the VOR range vary by altitude difference.
- */
-static double kludgeRange ( double stationElev, double aircraftElev,
-			    double nominalRange)
-{
-				// Assume that the nominal range (usually
-				// 50nm) applies at a 5,000 ft difference.
-				// Just a wild guess!
-  double factor = ((aircraftElev*SG_METER_TO_FEET) - stationElev) / 5000.0;
-  double range = fabs(nominalRange * factor);
-
-				// Clamp the range to keep it sane; for
-				// now, never less than 25% or more than
-				// 500% of nominal range.
-  if (range < nominalRange/4.0) {
-    range = nominalRange/4.0;
-  } else if (range > nominalRange*5.0) {
-    range = nominalRange*5.0;
-  }
-
-  return range;
-}
-
-
-// periodic radio station search wrapper
-static void fgRadioSearch( void ) {
-    current_radiostack->search();
-}
-
 // Constructor
 FGRadioStack::FGRadioStack() {
-    nav1_radial = 0.0;
-    nav1_dme_dist = 0.0;
-    nav2_radial = 0.0;
-    nav2_dme_dist = 0.0;
-    need_update = true;
-    lon_node = fgGetNode("/position/longitude-deg");
-    lat_node = fgGetNode("/position/latitude-deg");
-    alt_node = fgGetNode("/position/altitude-ft");
 }
 
 
 // Destructor
 FGRadioStack::~FGRadioStack() 
 {
-    unbind();			// FIXME: should be called externally
+    adf.unbind();
+    beacon.unbind();
+    navcom1.unbind();
+    navcom2.unbind();
+    xponder.unbind();
 }
 
 
 void
 FGRadioStack::init ()
 {
-    morse.init();
-    beacon.init();
-    blink.stamp();
+    navcom1.set_bind_index( 0 );
+    navcom1.init();
 
-    search();
-    update();
+    navcom2.set_bind_index( 1 );
+    navcom2.init();
 
-    SGPath path( globals->get_fg_root() );
-    SGPath term = path;
-    term.append( "Navaids/range.term" );
-    SGPath low = path;
-    low.append( "Navaids/range.low" );
-    SGPath high = path;
-    high.append( "Navaids/range.high" );
+    adf.init();
+    beacon.init();
+    xponder.init();
 
-    term_tbl = new SGInterpTable( term.str() );
-    low_tbl = new SGInterpTable( low.str() );
-    high_tbl = new SGInterpTable( high.str() );
+    search();
+    update(0);			// FIXME: use dt
 
     // Search radio database once per second
-    global_events.Register( "fgRadioSearch()", fgRadioSearch,
-			    fgEVENT::FG_EVENT_READY, 1000);
+    globals->get_event_mgr()->addTask( "fgRadioSearch()", current_radiostack,
+                                       &FGRadioStack::search, 1 );
 }
 
+
 void
 FGRadioStack::bind ()
 {
-				// User inputs
-    fgTie("/radios/nav[0]/frequencies/selected-mhz", this,
-	  &FGRadioStack::get_nav1_freq, &FGRadioStack::set_nav1_freq);
-    fgTie("/radios/nav[0]/standby-mhz", this,
-	  &FGRadioStack::get_nav1_alt_freq, &FGRadioStack::set_nav1_alt_freq);
-    fgTie("/radios/nav[0]/radials/selected-deg", this,
-	  &FGRadioStack::get_nav1_sel_radial,
-	  &FGRadioStack::set_nav1_sel_radial);
-    fgTie("/radios/nav[0]/volume", this,
-	  &FGRadioStack::get_nav1_vol_btn,
-	  &FGRadioStack::set_nav1_vol_btn);
-    fgTie("/radios/nav[0]/ident", this,
-	  &FGRadioStack::get_nav1_ident_btn,
-	  &FGRadioStack::set_nav1_ident_btn);
-
-				// Radio outputs
-    fgTie("/radios/nav[0]/radials/actual-deg", this, &FGRadioStack::get_nav1_radial);
-    fgTie("/radios/nav[0]/to-flag", this, &FGRadioStack::get_nav1_to_flag);
-    fgTie("/radios/nav[0]/from-flag", this, &FGRadioStack::get_nav1_from_flag);
-    fgTie("/radios/nav[0]/in-range", this, &FGRadioStack::get_nav1_inrange);
-    fgTie("/radios/nav[0]/dme/distance-nm", this, &FGRadioStack::get_nav1_dme_dist);
-    fgTie("/radios/nav[0]/dme/in-range", this,
-	  &FGRadioStack::get_nav1_dme_inrange);
-    fgTie("/radios/nav[0]/heading-needle-deflection", this,
-	  &FGRadioStack::get_nav1_heading_needle_deflection);
-    fgTie("/radios/nav[0]/gs-needle-deflection", this,
-	  &FGRadioStack::get_nav1_gs_needle_deflection);
-
-				// User inputs
-    fgTie("/radios/nav[1]/frequencies/selected-mhz", this,
-	  &FGRadioStack::get_nav2_freq, &FGRadioStack::set_nav2_freq);
-    fgTie("/radios/nav[1]/standby-mhz", this,
-	  &FGRadioStack::get_nav2_alt_freq, &FGRadioStack::set_nav2_alt_freq);
-    fgTie("/radios/nav[1]/radials/selected-deg", this,
-	  &FGRadioStack::get_nav2_sel_radial,
-	  &FGRadioStack::set_nav2_sel_radial);
-    fgTie("/radios/nav[1]/volume", this,
-	  &FGRadioStack::get_nav2_vol_btn,
-	  &FGRadioStack::set_nav2_vol_btn);
-    fgTie("/radios/nav[1]/ident", this,
-	  &FGRadioStack::get_nav2_ident_btn,
-	  &FGRadioStack::set_nav2_ident_btn);
-
-				// Radio outputs
-    fgTie("/radios/nav[1]/radials/actual-deg", this, &FGRadioStack::get_nav2_radial);
-    fgTie("/radios/nav[1]/to-flag", this, &FGRadioStack::get_nav2_to_flag);
-    fgTie("/radios/nav[1]/from-flag", this, &FGRadioStack::get_nav2_from_flag);
-    fgTie("/radios/nav[1]/in-range", this, &FGRadioStack::get_nav2_inrange);
-    fgTie("/radios/nav[1]/dme/distance-nm", this, &FGRadioStack::get_nav2_dme_dist);
-    fgTie("/radios/nav[1]/dme/in-range", this,
-	  &FGRadioStack::get_nav2_dme_inrange);
-    fgTie("/radios/nav[1]/heading-needle-deflection", this,
-	  &FGRadioStack::get_nav2_heading_needle_deflection);
-    fgTie("/radios/nav[1]/gs-needle-deflection", this,
-	  &FGRadioStack::get_nav2_gs_needle_deflection);
-
-				// User inputs
-    fgTie("/radios/adf/frequencies/selected-khz", this,
-	  &FGRadioStack::get_adf_freq, &FGRadioStack::set_adf_freq);
-    fgTie("/radios/adf/frequencies/standby-khz", this,
-	  &FGRadioStack::get_adf_alt_freq, &FGRadioStack::set_adf_alt_freq);
-    fgTie("/radios/adf/rotation-deg", this,
-	  &FGRadioStack::get_adf_rotation, &FGRadioStack::set_adf_rotation);
-    fgTie("/radios/adf/volume", this,
-	  &FGRadioStack::get_adf_vol_btn,
-	  &FGRadioStack::set_adf_vol_btn);
-    fgTie("/radios/adf/ident", this,
-	  &FGRadioStack::get_adf_ident_btn,
-	  &FGRadioStack::set_adf_ident_btn);
-
-    fgTie("/radios/marker-beacon/inner", this,
-	  &FGRadioStack::get_inner_blink);
-    fgTie("/radios/marker-beacon/middle", this,
-	  &FGRadioStack::get_middle_blink);
-    fgTie("/radios/marker-beacon/outer", this,
-	  &FGRadioStack::get_outer_blink);
+    adf.bind();
+    beacon.bind();
+    dme.bind();
+    navcom1.set_bind_index( 0 );
+    navcom1.bind();
+    navcom2.set_bind_index( 1 );
+    navcom2.bind();
+    xponder.bind();
 }
 
+
 void
 FGRadioStack::unbind ()
 {
-    fgUntie("/radios/nav[0]/frequencies/selected-mhz");
-    fgUntie("/radios/nav[0]/standby-mhz");
-    fgUntie("/radios/nav[0]/radials/actual-deg");
-    fgUntie("/radios/nav[0]/radials/selected-deg");
-    fgUntie("/radios/nav[0]/on");
-    fgUntie("/radios/nav[0]/ident");
-    fgUntie("/radios/nav[0]/to-flag");
-    fgUntie("/radios/nav[0]/from-flag");
-    fgUntie("/radios/nav[0]/in-range");
-    fgUntie("/radios/nav[0]/dme/distance-nm");
-    fgUntie("/radios/nav[0]/dme/in-range");
-    fgUntie("/radios/nav[0]/heading-needle-deflection");
-    fgUntie("/radios/nav[0]/gs-needle-deflection");
-
-    fgUntie("/radios/nav[1]/frequencies/selected-mhz");
-    fgUntie("/radios/nav[1]/standby-mhz");
-    fgUntie("/radios/nav[1]//radials/actual-deg");
-    fgUntie("/radios/nav[1]/radials/selected-deg");
-    fgUntie("/radios/nav[1]/on");
-    fgUntie("/radios/nav[1]/ident");
-    fgUntie("/radios/nav[1]/to-flag");
-    fgUntie("/radios/nav[1]/from-flag");
-    fgUntie("/radios/nav[1]/in-range");
-    fgUntie("/radios/nav[1]/dme/distance-nm");
-    fgUntie("/radios/nav[1]/dme/in-range");
-    fgUntie("/radios/nav[1]/heading-needle-deflection");
-    fgUntie("/radios/nav[1]/gs-needle-deflection");
-
-    fgUntie("/radios/adf/frequencies/selected-khz");
-    fgUntie("/radios/adf/frequencies/standby-khz");
-    fgUntie("/radios/adf/rotation-deg");
-    fgUntie("/radios/adf/on");
-    fgUntie("/radios/adf/ident");
-
-    fgUntie("/radios/marker-beacon/inner");
-    fgUntie("/radios/marker-beacon/middle");
-    fgUntie("/radios/marker-beacon/outer");
-}
-
-
-// model standard VOR/DME/TACAN service volumes as per AIM 1-1-8
-double FGRadioStack::adjustNavRange( double stationElev, double aircraftElev,
-			      double nominalRange )
-{
-    // extend out actual usable range to be 1.3x the published safe range
-    const double usability_factor = 1.3;
-
-    // assumptions we model the standard service volume, plus
-    // ... rather than specifying a cylinder, we model a cone that
-    // contains the cylinder.  Then we put an upside down cone on top
-    // to model diminishing returns at too-high altitudes.
-
-    // altitude difference
-    double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
-    // cout << "aircraft elev = " << aircraftElev * SG_METER_TO_FEET
-    //      << " station elev = " << stationElev << endl;
-
-    if ( nominalRange < 25.0 + SG_EPSILON ) {
-	// Standard Terminal Service Volume
-	return term_tbl->interpolate( alt ) * usability_factor;
-    } else if ( nominalRange < 50.0 + SG_EPSILON ) {
-	// Standard Low Altitude Service Volume
-	// table is based on range of 40, scale to actual range
-	return low_tbl->interpolate( alt ) * nominalRange / 40.0
-	    * usability_factor;
-    } else {
-	// Standard High Altitude Service Volume
-	// table is based on range of 130, scale to actual range
-	return high_tbl->interpolate( alt ) * nominalRange / 130.0
-	    * usability_factor;
-    }
-}
-
-
-// model standard ILS service volumes as per AIM 1-1-9
-double FGRadioStack::adjustILSRange( double stationElev, double aircraftElev,
-				     double offsetDegrees, double distance )
-{
-    // assumptions we model the standard service volume, plus
-
-    // altitude difference
-    // double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
-    double offset = fabs( offsetDegrees );
-
-    if ( offset < 10 ) {
-	return FG_ILS_DEFAULT_RANGE;
-    } else if ( offset < 35 ) {
-	return 10 + (35 - offset) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
-    } else if ( offset < 45 ) {
-	return (45 - offset);
-    } else {
-	return 0;
-    }
+    adf.unbind();
+    beacon.unbind();
+    dme.unbind();
+    navcom1.unbind();
+    navcom2.unbind();
+    xponder.unbind();
 }
 
 
 // Update the various nav values based on position and valid tuned in navs
 void 
-FGRadioStack::update() 
+FGRadioStack::update(double dt) 
 {
-    double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
-    double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
-    double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
-
-    need_update = false;
-
-    Point3D aircraft = sgGeodToCart( Point3D( lon, lat, elev ) );
-    Point3D station;
-    double az1, az2, s;
-
-    if ( nav1_valid ) {
-	station = Point3D( nav1_x, nav1_y, nav1_z );
-	nav1_loc_dist = aircraft.distance3D( station );
-
-	if ( nav1_has_dme ) {
-	    // staightline distance
-	    station = Point3D( nav1_dme_x, nav1_dme_y, nav1_dme_z );
-	    nav1_dme_dist = aircraft.distance3D( station );
-	} else {
-	    nav1_dme_dist = 0.0;
-	}
-
-	if ( nav1_has_gs ) {
-	    station = Point3D( nav1_gs_x, nav1_gs_y, nav1_gs_z );
-	    nav1_gs_dist = aircraft.distance3D( station );
-	} else {
-	    nav1_gs_dist = 0.0;
-	}
-	
-	// wgs84 heading
-	geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES, 
-			    nav1_loclat, nav1_loclon,
-			    &az1, &az2, &s );
-	// cout << "az1 = " << az1 << " magvar = " << nav1_magvar << endl;
-	nav1_heading = az1 - nav1_magvar;
-	// cout << " heading = " << nav1_heading
-	//      << " dist = " << nav1_dist << endl;
-
-	if ( nav1_loc ) {
-	    double offset = nav1_heading - nav1_radial;
-	    while ( offset < -180.0 ) { offset += 360.0; }
-	    while ( offset > 180.0 ) { offset -= 360.0; }
-	    // cout << "ils offset = " << offset << endl;
-	    nav1_effective_range = adjustILSRange(nav1_elev, elev, offset,
-						  nav1_loc_dist * SG_METER_TO_NM );
-	} else {
-	    nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
-	}
-	// cout << "nav1 range = " << nav1_effective_range
-	//      << " (" << nav1_range << ")" << endl;
-
-	if ( nav1_loc_dist < nav1_effective_range * SG_NM_TO_METER ) {
-	    nav1_inrange = true;
-	} else if ( nav1_loc_dist < 2 * nav1_effective_range * SG_NM_TO_METER ) {
-	    nav1_inrange = sg_random() < 
-		( 2 * nav1_effective_range * SG_NM_TO_METER - nav1_loc_dist ) /
-		(nav1_effective_range * SG_NM_TO_METER);
-	} else {
-	    nav1_inrange = false;
-	}
-
-	if ( !nav1_loc ) {
-	    nav1_radial = nav1_sel_radial;
-	}
-    } else {
-	nav1_inrange = false;
-	nav1_dme_dist = 0.0;
-	// cout << "not picking up vor. :-(" << endl;
-    }
-
-#ifdef ENABLE_AUDIO_SUPPORT
-    if ( nav1_valid && nav1_inrange ) {
-	// play station ident via audio system if on + ident,
-	// otherwise turn it off
-	if ( nav1_vol_btn > 0.1 && nav1_ident_btn ) {
-	    FGSimpleSound *sound;
-	    sound = globals->get_soundmgr()->find( "nav1-vor-ident" );
-	    sound->set_volume( nav1_vol_btn * 0.3 );
-	    sound = globals->get_soundmgr()->find( "nav1-dme-ident" );
-	    sound->set_volume( nav1_vol_btn * 0.3 );
-	    if ( nav1_last_time <
-		 globals->get_time_params()->get_cur_time() - 30 ) {
-		nav1_last_time = globals->get_time_params()->get_cur_time();
-		nav1_play_count = 0;
-	    }
-	    if ( nav1_play_count < 4 ) {
-		// play VOR ident
-		if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") ) {
-		    globals->get_soundmgr()->play_once( "nav1-vor-ident" );
-		    ++nav1_play_count;
-		}
-	    } else if ( nav1_play_count < 5 && nav1_has_dme ) {
-		// play DME ident
-		if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") &&
-		     !globals->get_soundmgr()->is_playing("nav1-dme-ident") ) {
-		    globals->get_soundmgr()->play_once( "nav1-dme-ident" );
-		    ++nav1_play_count;
-		}
-	    }
-	} else {
-	    globals->get_soundmgr()->stop( "nav1-vor-ident" );
-	    globals->get_soundmgr()->stop( "nav1-dme-ident" );
-	}
-    }
-#endif
-
-    if ( nav2_valid ) {
-	station = Point3D( nav2_x, nav2_y, nav2_z );
-	nav2_loc_dist = aircraft.distance3D( station );
-
-	if ( nav2_has_dme ) {
-	    // staightline distance
-	    station = Point3D( nav2_dme_x, nav2_dme_y, nav2_dme_z );
-	    nav2_dme_dist = aircraft.distance3D( station );
-	} else {
-	    nav2_dme_dist = 0.0;
-	}
-
-	if ( nav2_has_gs ) {
-	    station = Point3D( nav2_gs_x, nav2_gs_y, nav2_gs_z );
-	    nav2_gs_dist = aircraft.distance3D( station );
-	} else {
-	    nav2_gs_dist = 0.0;
-	}
-
-	// wgs84 heading
-	geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES, 
-			    nav2_loclat, nav2_loclon,
-			    &az1, &az2, &s );
-	nav2_heading = az1 - nav2_magvar;
-	// cout << " heading = " << nav2_heading
-	//      << " dist = " << nav2_dist << endl;
-
-	if ( nav2_loc ) {
-	    double offset = nav2_heading - nav2_radial;
-	    while ( offset < -180.0 ) { offset += 360.0; }
-	    while ( offset > 180.0 ) { offset -= 360.0; }
-	    // cout << "ils offset = " << offset << endl;
-	    nav2_effective_range = adjustILSRange(nav2_elev, elev, offset,
-						  nav2_loc_dist * SG_METER_TO_NM );
-	} else {
-	    nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
-	}
-	// cout << "nav2 range = " << nav2_effective_range
-	//      << " (" << nav2_range << ")" << endl;
-
-	if ( nav2_loc_dist < nav2_effective_range * SG_NM_TO_METER ) {
-	    nav2_inrange = true;
-	} else if ( nav2_loc_dist < 2 * nav2_effective_range * SG_NM_TO_METER ) {
-	    nav2_inrange = sg_random() < 
-		( 2 * nav2_effective_range * SG_NM_TO_METER - nav2_loc_dist ) /
-		(nav2_effective_range * SG_NM_TO_METER);
-	} else {
-	    nav2_inrange = false;
-	}
-
-	if ( !nav2_loc ) {
-	    nav2_radial = nav2_sel_radial;
-	}
-    } else {
-	nav2_inrange = false;
-	nav2_dme_dist = 0.0;
-	// cout << "not picking up vor. :-(" << endl;
-    }
-
-#ifdef ENABLE_AUDIO_SUPPORT
-    if ( nav2_valid && nav2_inrange ) {
-	// play station ident via audio system if on + ident,
-	// otherwise turn it off
-	if ( nav2_vol_btn > 0.1 && nav2_ident_btn ) {
-	    FGSimpleSound *sound;
-	    sound = globals->get_soundmgr()->find( "nav2-vor-ident" );
-	    sound->set_volume( nav2_vol_btn * 0.3 );
-	    sound = globals->get_soundmgr()->find( "nav2-dme-ident" );
-	    sound->set_volume( nav2_vol_btn * 0.3 );
-	    if ( nav2_last_time <
-		 globals->get_time_params()->get_cur_time() - 30 ) {
-		nav2_last_time = globals->get_time_params()->get_cur_time();
-		nav2_play_count = 0;
-	    }
-	    if ( nav2_play_count < 4 ) {
-		// play VOR ident
-		if ( !globals->get_soundmgr()->is_playing("nav2-vor-ident") ) {
-		    globals->get_soundmgr()->play_once( "nav2-vor-ident" );
-		    ++nav2_play_count;
-		}
-	    } else if ( nav2_play_count < 5 && nav2_has_dme ) {
-		// play DME ident
-		if ( !globals->get_soundmgr()->is_playing("nav2-vor-ident") &&
-		     !globals->get_soundmgr()->is_playing("nav2-dme-ident") ) {
-		    globals->get_soundmgr()->play_once( "nav2-dme-ident" );
-		    ++nav2_play_count;
-		}
-	    }
-	} else {
-	    globals->get_soundmgr()->stop( "nav2-vor-ident" );
-	    globals->get_soundmgr()->stop( "nav2-dme-ident" );
-	}
-    }
-#endif
-
-    // adf
-    if ( adf_valid ) {
-	// staightline distance
-	station = Point3D( adf_x, adf_y, adf_z );
-	adf_dist = aircraft.distance3D( station );
-
-	// wgs84 heading
-	geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES, 
-			    adf_lat, adf_lon,
-			    &az1, &az2, &s );
-	adf_heading = az1;
-	// cout << " heading = " << nav2_heading
-	//      << " dist = " << nav2_dist << endl;
-
-	adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
-	if ( adf_dist < adf_effective_range * SG_NM_TO_METER ) {
-	    adf_inrange = true;
-	} else if ( adf_dist < 2 * adf_effective_range * SG_NM_TO_METER ) {
-	    adf_inrange = sg_random() < 
-		( 2 * adf_effective_range * SG_NM_TO_METER - adf_dist ) /
-		(adf_effective_range * SG_NM_TO_METER);
-	} else {
-	    adf_inrange = false;
-	}
-    } else {
-	adf_inrange = false;
-    }
-
-#ifdef ENABLE_AUDIO_SUPPORT
-    if ( adf_valid && adf_inrange ) {
-	// play station ident via audio system if on + ident,
-	// otherwise turn it off
-	if ( adf_vol_btn > 0.1 && adf_ident_btn ) {
-	    FGSimpleSound *sound;
-	    sound = globals->get_soundmgr()->find( "adf-ident" );
-	    sound->set_volume( adf_vol_btn * 0.3 );
-	    if ( adf_last_time <
-		 globals->get_time_params()->get_cur_time() - 30 ) {
-		adf_last_time = globals->get_time_params()->get_cur_time();
-		adf_play_count = 0;
-	    }
-	    if ( adf_play_count < 4 ) {
-		// play ADF ident
-		if ( !globals->get_soundmgr()->is_playing("adf-ident") ) {
-		    globals->get_soundmgr()->play_once( "adf-ident" );
-		    ++adf_play_count;
-		}
-	    }
-	} else {
-	    globals->get_soundmgr()->stop( "adf-ident" );
-	}
-    }
-#endif
-
-    // marker beacon blinking
-    bool light_on = ( outer_blink || middle_blink || inner_blink );
-    SGTimeStamp current;
-    current.stamp();
-
-    if ( light_on && (current - blink > 400000) ) {
-	light_on = false;
-	blink.stamp();
-    } else if ( !light_on && (current - blink > 100000) ) {
-	light_on = true;
-	blink.stamp();
-    }
-
-    if ( outer_marker ) {
-	outer_blink = light_on;
-    } else {
-	outer_blink = false;
-    }
-
-    if ( middle_marker ) {
-	middle_blink = light_on;
-    } else {
-	middle_blink = false;
-    }
-
-    if ( inner_marker ) {
-	inner_blink = light_on;
-    } else {
-	inner_blink = false;
-    }
-
-    // cout << outer_blink << " " << middle_blink << " " << inner_blink << endl;
+    adf.update( dt );
+    beacon.update( dt );
+    navcom1.update( dt );
+    navcom2.update( dt );
+    dme.update( dt );           // dme is updated after the navcom's
+    xponder.update( dt );
 }
 
 
 // Update current nav/adf radio stations based on current postition
 void FGRadioStack::search() 
 {
-    static FGMkrBeacon::fgMkrBeacType last_beacon = FGMkrBeacon::NOBEACON;
-
-    double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
-    double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
-    double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
-
-    // nav1
-    FGILS ils;
-    FGNav nav;
-
-    static string last_nav1_ident = "";
-    static string last_nav2_ident = "";
-    static string last_adf_ident = "";
-    static bool last_nav1_vor = false;
-    static bool last_nav2_vor = false;
-    if ( current_ilslist->query( lon, lat, elev, nav1_freq, &ils ) ) {
-	nav1_ident = ils.get_locident();
-	nav1_valid = true;
-	if ( last_nav1_ident != nav1_ident || last_nav1_vor ) {
-	    nav1_trans_ident = ils.get_trans_ident();
-	    last_nav1_ident = nav1_ident;
-	    last_nav1_vor = false;
-	    nav1_loc = true;
-	    nav1_has_dme = ils.get_has_dme();
-	    nav1_has_gs = ils.get_has_gs();
-
-	    nav1_loclon = ils.get_loclon();
-	    nav1_loclat = ils.get_loclat();
-	    nav1_gslon = ils.get_gslon();
-	    nav1_gslat = ils.get_gslat();
-	    nav1_dmelon = ils.get_dmelon();
-	    nav1_dmelat = ils.get_dmelat();
-	    nav1_elev = ils.get_gselev();
-	    nav1_magvar = 0;
-	    nav1_range = FG_ILS_DEFAULT_RANGE;
-	    nav1_effective_range = nav1_range;
-	    nav1_target_gs = ils.get_gsangle();
-	    nav1_radial = ils.get_locheading();
-	    while ( nav1_radial <   0.0 ) { nav1_radial += 360.0; }
-	    while ( nav1_radial > 360.0 ) { nav1_radial -= 360.0; }
-	    nav1_x = ils.get_x();
-	    nav1_y = ils.get_y();
-	    nav1_z = ils.get_z();
-	    nav1_gs_x = ils.get_gs_x();
-	    nav1_gs_y = ils.get_gs_y();
-	    nav1_gs_z = ils.get_gs_z();
-	    nav1_dme_x = ils.get_dme_x();
-	    nav1_dme_y = ils.get_dme_y();
-	    nav1_dme_z = ils.get_dme_z();
-
-#ifdef ENABLE_AUDIO_SUPPORT
-	    if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
-		globals->get_soundmgr()->remove( "nav1-vor-ident" );
-	    }
-	    FGSimpleSound *sound;
-	    sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
-	    sound->set_volume( 0.3 );
-	    globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
-
-	    if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
-		globals->get_soundmgr()->remove( "nav1-dme-ident" );
-	    }
-	    sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
-	    sound->set_volume( 0.3 );
-	    globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
-
-	    int offset = (int)(sg_random() * 30.0);
-	    nav1_play_count = offset / 4;
-	    nav1_last_time = globals->get_time_params()->get_cur_time() -
-		offset;
-	    // cout << "offset = " << offset << " play_count = "
-	    //      << nav1_play_count
-	    //      << " nav1_last_time = " << nav1_last_time
-	    //      << " current time = "
-	    //      << globals->get_time_params()->get_cur_time() << endl;
-#endif
-
-	    // cout << "Found an ils station in range" << endl;
-	    // cout << " id = " << ils.get_locident() << endl;
-	}
-    } else if ( current_navlist->query( lon, lat, elev, nav1_freq, &nav ) ) {
-	nav1_ident = nav.get_ident();
-	nav1_valid = true;
-	if ( last_nav1_ident != nav1_ident || !last_nav1_vor ) {
-	    last_nav1_ident = nav1_ident;
-	    last_nav1_vor = true;
-	    nav1_trans_ident = nav.get_trans_ident();
-	    nav1_loc = false;
-	    nav1_has_dme = nav.get_has_dme();
-	    nav1_has_gs = false;
-	    nav1_loclon = nav.get_lon();
-	    nav1_loclat = nav.get_lat();
-	    nav1_elev = nav.get_elev();
-	    nav1_magvar = nav.get_magvar();
-	    nav1_range = nav.get_range();
-	    nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
-	    nav1_target_gs = 0.0;
-	    nav1_radial = nav1_sel_radial;
-	    nav1_x = nav1_dme_x = nav.get_x();
-	    nav1_y = nav1_dme_y = nav.get_y();
-	    nav1_z = nav1_dme_z = nav.get_z();
-
-#ifdef ENABLE_AUDIO_SUPPORT
-	    if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
-		globals->get_soundmgr()->remove( "nav1-vor-ident" );
-	    }
-	    FGSimpleSound *sound;
-	    sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
-	    sound->set_volume( 0.3 );
-	    globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
-
-	    if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
-		globals->get_soundmgr()->remove( "nav1-dme-ident" );
-	    }
-	    sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
-	    sound->set_volume( 0.3 );
-	    globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
-
-	    int offset = (int)(sg_random() * 30.0);
-	    nav1_play_count = offset / 4;
-	    nav1_last_time = globals->get_time_params()->get_cur_time() -
-		offset;
-	    // cout << "offset = " << offset << " play_count = "
-	    //      << nav1_play_count << " nav1_last_time = "
-	    //      << nav1_last_time << " current time = "
-	    //      << globals->get_time_params()->get_cur_time() << endl;
-#endif
-
-	    // cout << "Found a vor station in range" << endl;
-	    // cout << " id = " << nav.get_ident() << endl;
-	}
-    } else {
-	nav1_valid = false;
-	nav1_ident = "";
-	nav1_radial = 0;
-	nav1_dme_dist = 0;
-	nav1_trans_ident = "";
-	last_nav1_ident = "";
-#ifdef ENABLE_AUDIO_SUPPORT
-	globals->get_soundmgr()->remove( "nav1-vor-ident" );
-	globals->get_soundmgr()->remove( "nav1-dme-ident" );
-#endif
-	// cout << "not picking up vor1. :-(" << endl;
-    }
-
-    if ( current_ilslist->query( lon, lat, elev, nav2_freq, &ils ) ) {
-	nav2_ident = ils.get_locident();
-	nav2_valid = true;
-	if ( last_nav2_ident != nav2_ident || last_nav2_vor ) {
-	    last_nav2_ident = nav2_ident;
-	    last_nav2_vor = false;
-	    nav2_trans_ident = ils.get_trans_ident();
-	    nav2_loc = true;
-	    nav2_has_dme = ils.get_has_dme();
-	    nav2_has_gs = ils.get_has_gs();
-
-	    nav2_loclon = ils.get_loclon();
-	    nav2_loclat = ils.get_loclat();
-	    nav2_elev = ils.get_gselev();
-	    nav2_magvar = 0;
-	    nav2_range = FG_ILS_DEFAULT_RANGE;
-	    nav2_effective_range = nav2_range;
-	    nav2_target_gs = ils.get_gsangle();
-	    nav2_radial = ils.get_locheading();
-	    while ( nav2_radial <   0.0 ) { nav2_radial += 360.0; }
-	    while ( nav2_radial > 360.0 ) { nav2_radial -= 360.0; }
-	    nav2_x = ils.get_x();
-	    nav2_y = ils.get_y();
-	    nav2_z = ils.get_z();
-	    nav2_gs_x = ils.get_gs_x();
-	    nav2_gs_y = ils.get_gs_y();
-	    nav2_gs_z = ils.get_gs_z();
-	    nav2_dme_x = ils.get_dme_x();
-	    nav2_dme_y = ils.get_dme_y();
-	    nav2_dme_z = ils.get_dme_z();
-
-#ifdef ENABLE_AUDIO_SUPPORT
-	    if ( globals->get_soundmgr()->exists( "nav2-vor-ident" ) ) {
-		globals->get_soundmgr()->remove( "nav2-vor-ident" );
-	    }
-	    FGSimpleSound *sound;
-	    sound = morse.make_ident( nav2_trans_ident, LO_FREQUENCY );
-	    sound->set_volume( 0.3 );
-	    globals->get_soundmgr()->add( sound, "nav2-vor-ident" );
-
-	    if ( globals->get_soundmgr()->exists( "nav2-dme-ident" ) ) {
-		globals->get_soundmgr()->remove( "nav2-dme-ident" );
-	    }
-	    sound = morse.make_ident( nav2_trans_ident, HI_FREQUENCY );
-	    sound->set_volume( 0.3 );
-	    globals->get_soundmgr()->add( sound, "nav2-dme-ident" );
-
-	    int offset = (int)(sg_random() * 30.0);
-	    nav2_play_count = offset / 4;
-	    nav2_last_time = globals->get_time_params()->get_cur_time() -
-		offset;
-	    // cout << "offset = " << offset << " play_count = "
-	    //      << nav2_play_count << " nav2_last_time = "
-	    //      << nav2_last_time << " current time = "
-	    //      << globals->get_time_params()->get_cur_time() << endl;
-#endif
-
-	    // cout << "Found an ils station in range" << endl;
-	    // cout << " id = " << ils.get_locident() << endl;
-	}
-    } else if ( current_navlist->query( lon, lat, elev, nav2_freq, &nav ) ) {
-	nav2_ident = nav.get_ident();
-	nav2_valid = true;
-	if ( last_nav2_ident != nav2_ident || !last_nav2_vor ) {
-	    last_nav2_ident = nav2_ident;
-	    last_nav2_vor = true;
-	    nav2_trans_ident = nav.get_trans_ident();
-	    nav2_loc = false;
-	    nav2_has_dme = nav.get_has_dme();
-	    nav2_has_dme = false;
-	    nav2_loclon = nav.get_lon();
-	    nav2_loclat = nav.get_lat();
-	    nav2_elev = nav.get_elev();
-	    nav2_magvar = nav.get_magvar();
-	    nav2_range = nav.get_range();
-	    nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
-	    nav2_target_gs = 0.0;
-	    nav2_radial = nav2_sel_radial;
-	    nav2_x = nav2_dme_x = nav.get_x();
-	    nav2_y = nav2_dme_y = nav.get_y();
-	    nav2_z = nav2_dme_z = nav.get_z();
-
-#ifdef ENABLE_AUDIO_SUPPORT
-	    if ( globals->get_soundmgr()->exists( "nav2-vor-ident" ) ) {
-		globals->get_soundmgr()->remove( "nav2-vor-ident" );
-	    }
-	    FGSimpleSound *sound;
-	    sound = morse.make_ident( nav2_trans_ident, LO_FREQUENCY );
-	    sound->set_volume( 0.3 );
-	    globals->get_soundmgr()->add( sound, "nav2-vor-ident" );
-
-	    if ( globals->get_soundmgr()->exists( "nav2-dme-ident" ) ) {
-		globals->get_soundmgr()->remove( "nav2-dme-ident" );
-	    }
-	    sound = morse.make_ident( nav2_trans_ident, HI_FREQUENCY );
-	    sound->set_volume( 0.3 );
-	    globals->get_soundmgr()->add( sound, "nav2-dme-ident" );
-
-	    int offset = (int)(sg_random() * 30.0);
-	    nav2_play_count = offset / 4;
-	    nav2_last_time = globals->get_time_params()->get_cur_time() -
-		offset;
-	    // cout << "offset = " << offset << " play_count = "
-	    //      << nav2_play_count << " nav2_last_time = "
-	    //      << nav2_last_time << " current time = "
-	    //      << globals->get_time_params()->get_cur_time() << endl;
-#endif
-
-	    // cout << "Found a vor station in range" << endl;
-	    // cout << " id = " << nav.get_ident() << endl;
-	}
-    } else {
-	nav2_valid = false;
-	nav2_ident = "";
-	nav2_radial = 0;
-	nav2_dme_dist = 0;
-	nav2_trans_ident = "";
-	last_nav2_ident = "";
-#ifdef ENABLE_AUDIO_SUPPORT
-	globals->get_soundmgr()->remove( "nav2-vor-ident" );
-	globals->get_soundmgr()->remove( "nav2-dme-ident" );
-#endif
-	// cout << "not picking up vor1. :-(" << endl;
-    }
-
-    FGMkrBeacon::fgMkrBeacType beacon_type
-	= current_beacons->query( lon * SGD_RADIANS_TO_DEGREES,
-				  lat * SGD_RADIANS_TO_DEGREES, elev );
-
-    outer_marker = middle_marker = inner_marker = false;
-
-    if ( beacon_type == FGMkrBeacon::OUTER ) {
-	outer_marker = true;
-	// cout << "OUTER MARKER" << endl;
-#ifdef ENABLE_AUDIO_SUPPORT
-	if ( last_beacon != FGMkrBeacon::OUTER ) {
-	    if ( ! globals->get_soundmgr()->exists( "outer-marker" ) ) {
-		FGSimpleSound *sound = beacon.get_outer();
-		sound->set_volume( 0.3 );
-		globals->get_soundmgr()->add( sound, "outer-marker" );
-	    }
-	    if ( !globals->get_soundmgr()->is_playing("outer-marker") ) {
-		globals->get_soundmgr()->play_looped( "outer-marker" );
-	    }
-	}
-#endif
-    } else if ( beacon_type == FGMkrBeacon::MIDDLE ) {
-	middle_marker = true;
-	// cout << "MIDDLE MARKER" << endl;
-#ifdef ENABLE_AUDIO_SUPPORT
-	if ( last_beacon != FGMkrBeacon::MIDDLE ) {
-	    if ( ! globals->get_soundmgr()->exists( "middle-marker" ) ) {
-		FGSimpleSound *sound = beacon.get_middle();
-		sound->set_volume( 0.3 );
-		globals->get_soundmgr()->add( sound, "middle-marker" );
-	    }
-	    if ( !globals->get_soundmgr()->is_playing("middle-marker") ) {
-		globals->get_soundmgr()->play_looped( "middle-marker" );
-	    }
-	}
-#endif
-    } else if ( beacon_type == FGMkrBeacon::INNER ) {
-	inner_marker = true;
-	// cout << "INNER MARKER" << endl;
-#ifdef ENABLE_AUDIO_SUPPORT
-	if ( last_beacon != FGMkrBeacon::INNER ) {
-	    if ( ! globals->get_soundmgr()->exists( "inner-marker" ) ) {
-		FGSimpleSound *sound = beacon.get_inner();
-		sound->set_volume( 0.3 );
-		globals->get_soundmgr()->add( sound, "inner-marker" );
-	    }
-	    if ( !globals->get_soundmgr()->is_playing("inner-marker") ) {
-		globals->get_soundmgr()->play_looped( "inner-marker" );
-	    }
-	}
-#endif
-    } else {
-	// cout << "no marker" << endl;
-#ifdef ENABLE_AUDIO_SUPPORT
-	globals->get_soundmgr()->stop( "outer-marker" );
-	globals->get_soundmgr()->stop( "middle-marker" );
-	globals->get_soundmgr()->stop( "inner-marker" );
-#endif
-    }
-    last_beacon = beacon_type;
-
-    // adf
-    if ( current_navlist->query( lon, lat, elev, adf_freq, &nav ) ) {
-	char freq[128];
-#if defined( _MSC_VER )
-	_snprintf( freq, 10, "%.0f", adf_freq );
-#else
-	snprintf( freq, 10, "%.0f", adf_freq );
-#endif
-	adf_ident = freq;
-	adf_ident += nav.get_ident();
-	// cout << "adf ident = " << adf_ident << endl;
-	adf_valid = true;
-	if ( last_adf_ident != adf_ident ) {
-	    last_adf_ident = adf_ident;
-
-	    adf_trans_ident = nav.get_trans_ident();
-	    adf_lon = nav.get_lon();
-	    adf_lat = nav.get_lat();
-	    adf_elev = nav.get_elev();
-	    adf_range = nav.get_range();
-	    adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
-	    adf_x = nav.get_x();
-	    adf_y = nav.get_y();
-	    adf_z = nav.get_z();
-
-#ifdef ENABLE_AUDIO_SUPPORT
-	    if ( globals->get_soundmgr()->exists( "adf-ident" ) ) {
-		globals->get_soundmgr()->remove( "adf-ident" );
-	    }
-	    FGSimpleSound *sound;
-	    sound = morse.make_ident( adf_trans_ident, LO_FREQUENCY );
-	    sound->set_volume( 0.3 );
-	    globals->get_soundmgr()->add( sound, "adf-ident" );
-
-	    int offset = (int)(sg_random() * 30.0);
-	    adf_play_count = offset / 4;
-	    adf_last_time = globals->get_time_params()->get_cur_time() -
-		offset;
-	    // cout << "offset = " << offset << " play_count = "
-	    //      << adf_play_count << " adf_last_time = "
-	    //      << adf_last_time << " current time = "
-	    //      << globals->get_time_params()->get_cur_time() << endl;
-#endif
-
-	    // cout << "Found an adf station in range" << endl;
-	    // cout << " id = " << nav.get_ident() << endl;
-	}
-    } else {
-	adf_valid = false;
-	adf_ident = "";
-	adf_trans_ident = "";
-#ifdef ENABLE_AUDIO_SUPPORT
-	globals->get_soundmgr()->remove( "adf-ident" );
-#endif
-	last_adf_ident = "";
-	// cout << "not picking up adf. :-(" << endl;
-    }
-}
-
-
-// return the amount of heading needle deflection, returns a value
-// clamped to the range of ( -10 , 10 )
-double FGRadioStack::get_nav1_heading_needle_deflection() const {
-    double r;
-
-    if ( nav1_inrange ) {
-        r = nav1_heading - nav1_radial;
-	// cout << "Radial = " << nav1_radial 
-	//      << "  Bearing = " << nav1_heading << endl;
-    
-	while ( r >  180.0 ) { r -= 360.0;}
-	while ( r < -180.0 ) { r += 360.0;}
-	if ( fabs(r) > 90.0 ) {
-	    r = ( r<0.0 ? -r-180.0 : -r+180.0 );
-	    if ( nav1_loc ) {
-		r = -r;
-	    }
-	}
-
-	// According to Robin Peel, the ILS is 4x more sensitive than a vor
-	if ( nav1_loc ) { r *= 4.0; }
-	if ( r < -10.0 ) { r = -10.0; }
-	if ( r >  10.0 ) { r = 10.0; }
-    } else {
-	r = 0.0;
-    }
-
-    return r;
-}
-
-// return the amount of heading needle deflection, returns a value
-// clamped to the range of ( -10 , 10 )
-double FGRadioStack::get_nav2_heading_needle_deflection() const {
-    double r;
-
-    if ( nav2_inrange ) {
-        r = nav2_heading - nav2_radial;
-	// cout << "Radial = " << nav2_radial 
-	//      << "  Bearing = " << nav2_heading << endl;
-    
-	while (r> 180.0) r-=360.0;
-	while (r<-180.0) r+=360.0;
-	if ( fabs(r) > 90.0 )
-	    r = ( r<0.0 ? -r-180.0 : -r+180.0 );
-	// According to Robin Peel, the ILS is 4x more sensitive than a vor
-	if ( nav2_loc ) r *= 4.0;
-	if ( r < -10.0 ) r = -10.0;
-	if ( r > 10.0 ) r = 10.0;
-    } else {
-	r = 0.0;
-    }
-
-    return r;
-}
-
-// return the amount of glide slope needle deflection (.i.e. the
-// number of degrees we are off the glide slope * 5.0
-double FGRadioStack::get_nav1_gs_needle_deflection() const {
-    if ( nav1_inrange && nav1_has_gs ) {
-	double x = nav1_gs_dist;
-	double y = (fgGetDouble("/position/altitude-ft") - nav1_elev)
-            * SG_FEET_TO_METER;
-	double angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
-	return (nav1_target_gs - angle) * 5.0;
-    } else {
-	return 0.0;
-    }
-}
-
-
-// return the amount of glide slope needle deflection (.i.e. the
-// number of degrees we are off the glide slope * 5.0
-double FGRadioStack::get_nav2_gs_needle_deflection() const {
-    if ( nav2_inrange && nav2_has_gs ) {
-	double x = nav2_gs_dist;
-	double y = (fgGetDouble("/position/altitude-ft") - nav2_elev)
-            * SG_FEET_TO_METER;
-	double angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
-	return (nav2_target_gs - angle) * 5.0;
-    } else {
-	return 0.0;
-    }
+    adf.search();
+    beacon.search();
+    navcom1.search();
+    navcom2.search();
+    dme.search();
+    xponder.search();
 }
-
-
-/**
- * Return true if the NAV1 TO flag should be active.
- */
-bool 
-FGRadioStack::get_nav1_to_flag () const
-{
-  if (nav1_inrange) {
-    double offset = fabs(nav1_heading - nav1_radial);
-    if (nav1_loc)
-      return true;
-    else
-      return (offset <= 90.0 || offset >= 270.0);
-  } else {
-    return false;
-  }
-}
-
-
-/**
- * Return true if the NAV1 FROM flag should be active.
- */
-bool
-FGRadioStack::get_nav1_from_flag () const
-{
-  if (nav1_inrange) {
-    double offset = fabs(nav1_heading - nav1_radial);
-    if (nav1_loc)
-      return false;
-    else
-      return (offset > 90.0 && offset < 270.0);
-  } else {
-    return false;
-  }
-}
-
-
-/**
- * Return true if the NAV2 TO flag should be active.
- */
-bool 
-FGRadioStack::get_nav2_to_flag () const
-{
-  if (nav2_inrange) {
-    double offset = fabs(nav2_heading - nav2_radial);
-    if (nav2_loc)
-      return true;
-    else
-      return (offset <= 90.0 || offset >= 270.0);
-  } else {
-    return false;
-  }
-}
-
-
-/**
- * Return true if the NAV2 FROM flag should be active.
- */
-bool
-FGRadioStack::get_nav2_from_flag () const
-{
-  if (nav2_inrange) {
-    double offset = fabs(nav2_heading - nav2_radial);
-    if (nav2_loc)
-      return false;
-    else
-      return (offset > 90.0 && offset < 270.0);
-  } else {
-    return false;
-  }
-}
-