1 // radiostack.cxx -- class to manage an instance of the radio stack
3 // Written by Curtis Olson, started April 2000.
5 // Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include <stdio.h> // snprintf
30 #include <simgear/compiler.h>
31 #include <simgear/math/sg_random.h>
33 #include <Aircraft/aircraft.hxx>
34 #include <Navaids/ilslist.hxx>
35 #include <Navaids/mkrbeacons.hxx>
36 #include <Navaids/navlist.hxx>
37 #include <Time/FGEventMgr.hxx>
39 #include "radiostack.hxx"
44 static int nav1_play_count = 0;
45 static int nav2_play_count = 0;
46 static int adf_play_count = 0;
47 static time_t nav1_last_time = 0;
48 static time_t nav2_last_time = 0;
49 static time_t adf_last_time = 0;
52 FGRadioStack *current_radiostack;
56 * Boy, this is ugly! Make the VOR range vary by altitude difference.
58 static double kludgeRange ( double stationElev, double aircraftElev,
61 // Assume that the nominal range (usually
62 // 50nm) applies at a 5,000 ft difference.
64 double factor = ((aircraftElev*SG_METER_TO_FEET) - stationElev) / 5000.0;
65 double range = fabs(nominalRange * factor);
67 // Clamp the range to keep it sane; for
68 // now, never less than 25% or more than
69 // 500% of nominal range.
70 if (range < nominalRange/4.0) {
71 range = nominalRange/4.0;
72 } else if (range > nominalRange*5.0) {
73 range = nominalRange*5.0;
81 FGRadioStack::FGRadioStack() :
82 lon_node(fgGetNode("/position/longitude-deg", true)),
83 lat_node(fgGetNode("/position/latitude-deg", true)),
84 alt_node(fgGetNode("/position/altitude-ft", true)),
107 SGPath path( globals->get_fg_root() );
109 term.append( "Navaids/range.term" );
111 low.append( "Navaids/range.low" );
113 high.append( "Navaids/range.high" );
115 term_tbl = new SGInterpTable( term.str() );
116 low_tbl = new SGInterpTable( low.str() );
117 high_tbl = new SGInterpTable( high.str() );
118 dme_last_time.stamp();
123 FGRadioStack::~FGRadioStack()
125 unbind(); // FIXME: should be called externally
134 FGRadioStack::init ()
141 update(1); // FIXME: use dt
143 // Search radio database once per second
144 global_events.Register( "fgRadioSearch()",
145 current_radiostack, &FGRadioStack::search,
150 FGRadioStack::bind ()
153 fgTie("/radios/comm[0]/frequencies/selected-mhz", this,
154 &FGRadioStack::get_comm1_freq, &FGRadioStack::set_comm1_freq);
155 fgSetArchivable("/radios/comm[0]/frequencies/selected-mhz");
156 fgTie("/radios/comm[0]/frequencies/standby-mhz", this,
157 &FGRadioStack::get_comm1_alt_freq, &FGRadioStack::set_comm1_alt_freq);
158 fgSetArchivable("/radios/comm[0]/frequencies/standby-mhz");
159 fgTie("/radios/comm[0]/volume", this,
160 &FGRadioStack::get_comm1_vol_btn,
161 &FGRadioStack::set_comm1_vol_btn);
162 fgSetArchivable("/radios/comm[0]/volume");
163 fgTie("/radios/comm[0]/ident", this,
164 &FGRadioStack::get_comm1_ident_btn,
165 &FGRadioStack::set_comm1_ident_btn);
166 fgSetArchivable("/radios/comm[0]/ident");
168 fgTie("/radios/comm[1]/frequencies/selected-mhz", this,
169 &FGRadioStack::get_comm2_freq, &FGRadioStack::set_comm2_freq);
170 fgSetArchivable("/radios/comm[0]/frequencies/selected-mhz");
171 fgTie("/radios/comm[1]/frequencies/standby-mhz", this,
172 &FGRadioStack::get_comm2_alt_freq, &FGRadioStack::set_comm2_alt_freq);
173 fgSetArchivable("/radios/comm[0]/frequencies/standby-mhz");
174 fgTie("/radios/comm[1]/volume", this,
175 &FGRadioStack::get_comm2_vol_btn,
176 &FGRadioStack::set_comm2_vol_btn);
177 fgSetArchivable("/radios/comm[0]/volume");
178 fgTie("/radios/comm[1]/ident", this,
179 &FGRadioStack::get_comm2_ident_btn,
180 &FGRadioStack::set_comm2_ident_btn);
181 fgSetArchivable("/radios/comm[1]/ident");
183 fgTie("/radios/nav[0]/frequencies/selected-mhz", this,
184 &FGRadioStack::get_nav1_freq, &FGRadioStack::set_nav1_freq);
185 fgSetArchivable("/radios/nav[0]/frequencies/selected-mhz");
186 fgTie("/radios/nav[0]/frequencies/standby-mhz", this,
187 &FGRadioStack::get_nav1_alt_freq, &FGRadioStack::set_nav1_alt_freq);
188 fgSetArchivable("/radios/nav[0]/frequencies/standby-mhz");
189 fgTie("/radios/nav[0]/radials/selected-deg", this,
190 &FGRadioStack::get_nav1_sel_radial,
191 &FGRadioStack::set_nav1_sel_radial);
192 fgSetArchivable("/radios/nav[0]/radials/selected-deg");
193 fgTie("/radios/nav[0]/volume", this,
194 &FGRadioStack::get_nav1_vol_btn,
195 &FGRadioStack::set_nav1_vol_btn);
196 fgSetArchivable("/radios/nav[0]/volume");
197 fgTie("/radios/nav[0]/ident", this,
198 &FGRadioStack::get_nav1_ident_btn,
199 &FGRadioStack::set_nav1_ident_btn);
200 fgSetArchivable("/radios/nav[0]/ident");
203 fgTie("/radios/nav[0]/radials/actual-deg", this,
204 &FGRadioStack::get_nav1_radial);
205 fgTie("/radios/nav[0]/to-flag", this, &FGRadioStack::get_nav1_to_flag);
206 fgTie("/radios/nav[0]/from-flag", this, &FGRadioStack::get_nav1_from_flag);
207 fgTie("/radios/nav[0]/in-range", this, &FGRadioStack::get_nav1_inrange);
208 fgTie("/radios/nav[0]/heading-needle-deflection", this,
209 &FGRadioStack::get_nav1_heading_needle_deflection);
210 fgTie("/radios/nav[0]/gs-needle-deflection", this,
211 &FGRadioStack::get_nav1_gs_needle_deflection);
214 fgTie("/radios/nav[1]/frequencies/selected-mhz", this,
215 &FGRadioStack::get_nav2_freq, &FGRadioStack::set_nav2_freq);
216 fgSetArchivable("/radios/nav[1]/frequencies/selected-mhz");
217 fgTie("/radios/nav[1]/frequencies/standby-mhz", this,
218 &FGRadioStack::get_nav2_alt_freq, &FGRadioStack::set_nav2_alt_freq);
219 fgSetArchivable("/radios/nav[1]/frequencies/standby-mhz");
220 fgTie("/radios/nav[1]/radials/selected-deg", this,
221 &FGRadioStack::get_nav2_sel_radial,
222 &FGRadioStack::set_nav2_sel_radial);
223 fgSetArchivable("/radios/nav[1]/radials/selected-deg");
224 fgTie("/radios/nav[1]/volume", this,
225 &FGRadioStack::get_nav2_vol_btn,
226 &FGRadioStack::set_nav2_vol_btn);
227 fgSetArchivable("/radios/nav[1]/volume");
228 fgTie("/radios/nav[1]/ident", this,
229 &FGRadioStack::get_nav2_ident_btn,
230 &FGRadioStack::set_nav2_ident_btn);
231 fgSetArchivable("/radios/nav[1]/ident");
234 fgTie("/radios/nav[1]/radials/actual-deg", this,
235 &FGRadioStack::get_nav2_radial);
236 fgTie("/radios/nav[1]/to-flag", this, &FGRadioStack::get_nav2_to_flag);
237 fgTie("/radios/nav[1]/from-flag", this, &FGRadioStack::get_nav2_from_flag);
238 fgTie("/radios/nav[1]/in-range", this, &FGRadioStack::get_nav2_inrange);
239 fgTie("/radios/nav[1]/heading-needle-deflection", this,
240 &FGRadioStack::get_nav2_heading_needle_deflection);
241 fgTie("/radios/nav[1]/gs-needle-deflection", this,
242 &FGRadioStack::get_nav2_gs_needle_deflection);
245 fgTie("/radios/dme/frequencies/selected-khz", this,
246 &FGRadioStack::get_dme_freq, &FGRadioStack::set_dme_freq);
249 fgTie("/radios/dme/in-range", this, &FGRadioStack::get_dme_inrange);
250 fgTie("/radios/dme/distance-nm", this, &FGRadioStack::get_dme_dist);
251 fgTie("/radios/dme/speed-kt", this, &FGRadioStack::get_dme_spd);
252 fgTie("/radios/dme/ete-min", this, &FGRadioStack::get_dme_ete);
255 fgTie("/radios/adf/frequencies/selected-khz", this,
256 &FGRadioStack::get_adf_freq, &FGRadioStack::set_adf_freq);
257 fgSetArchivable("/radios/adf/frequencies/selected-khz");
258 fgTie("/radios/adf/frequencies/standby-khz", this,
259 &FGRadioStack::get_adf_alt_freq, &FGRadioStack::set_adf_alt_freq);
260 fgSetArchivable("/radios/adf/frequencies/standby-khz");
261 fgTie("/radios/adf/rotation-deg", this,
262 &FGRadioStack::get_adf_rotation, &FGRadioStack::set_adf_rotation);
263 fgSetArchivable("/radios/adf/rotation-deg");
264 fgTie("/radios/adf/volume", this,
265 &FGRadioStack::get_adf_vol_btn,
266 &FGRadioStack::set_adf_vol_btn);
267 fgSetArchivable("/radios/adf/volume");
268 fgTie("/radios/adf/ident", this,
269 &FGRadioStack::get_adf_ident_btn,
270 &FGRadioStack::set_adf_ident_btn);
271 fgSetArchivable("/radios/adf/ident");
273 fgTie("/radios/marker-beacon/inner", this,
274 &FGRadioStack::get_inner_blink);
275 fgTie("/radios/marker-beacon/middle", this,
276 &FGRadioStack::get_middle_blink);
277 fgTie("/radios/marker-beacon/outer", this,
278 &FGRadioStack::get_outer_blink);
282 FGRadioStack::unbind ()
284 fgUntie("/radios/comm[0]/frequencies/selected-mhz");
285 fgUntie("/radios/comm[0]/frequencies/standby-mhz");
286 fgUntie("/radios/comm[0]/on");
287 fgUntie("/radios/comm[0]/ident");
289 fgUntie("/radios/comm[1]/frequencies/selected-mhz");
290 fgUntie("/radios/comm[1]/frequencies/standby-mhz");
291 fgUntie("/radios/comm[1]/on");
292 fgUntie("/radios/comm[1]/ident");
294 fgUntie("/radios/nav[0]/frequencies/selected-mhz");
295 fgUntie("/radios/nav[0]/frequencies/standby-mhz");
296 fgUntie("/radios/nav[0]/radials/actual-deg");
297 fgUntie("/radios/nav[0]/radials/selected-deg");
298 fgUntie("/radios/nav[0]/on");
299 fgUntie("/radios/nav[0]/ident");
300 fgUntie("/radios/nav[0]/to-flag");
301 fgUntie("/radios/nav[0]/from-flag");
302 fgUntie("/radios/nav[0]/in-range");
303 fgUntie("/radios/nav[0]/heading-needle-deflection");
304 fgUntie("/radios/nav[0]/gs-needle-deflection");
306 fgUntie("/radios/nav[1]/frequencies/selected-mhz");
307 fgUntie("/radios/nav[1]/frequencies/standby-mhz");
308 fgUntie("/radios/nav[1]/radials/actual-deg");
309 fgUntie("/radios/nav[1]/radials/selected-deg");
310 fgUntie("/radios/nav[1]/on");
311 fgUntie("/radios/nav[1]/ident");
312 fgUntie("/radios/nav[1]/to-flag");
313 fgUntie("/radios/nav[1]/from-flag");
314 fgUntie("/radios/nav[1]/in-range");
315 fgUntie("/radios/nav[1]/heading-needle-deflection");
316 fgUntie("/radios/nav[1]/gs-needle-deflection");
318 fgUntie("/radios/dme/frequencies/selected-khz");
321 fgUntie("/radios/dme/in-range");
322 fgUntie("/radios/dme/distance-nm");
323 fgUntie("/radios/dme/speed-kt");
324 fgUntie("/radios/dme/ete-min");
326 fgUntie("/radios/adf/frequencies/selected-khz");
327 fgUntie("/radios/adf/frequencies/standby-khz");
328 fgUntie("/radios/adf/rotation-deg");
329 fgUntie("/radios/adf/on");
330 fgUntie("/radios/adf/ident");
332 fgUntie("/radios/marker-beacon/inner");
333 fgUntie("/radios/marker-beacon/middle");
334 fgUntie("/radios/marker-beacon/outer");
338 // model standard VOR/DME/TACAN service volumes as per AIM 1-1-8
339 double FGRadioStack::adjustNavRange( double stationElev, double aircraftElev,
340 double nominalRange )
342 // extend out actual usable range to be 1.3x the published safe range
343 const double usability_factor = 1.3;
345 // assumptions we model the standard service volume, plus
346 // ... rather than specifying a cylinder, we model a cone that
347 // contains the cylinder. Then we put an upside down cone on top
348 // to model diminishing returns at too-high altitudes.
350 // altitude difference
351 double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
352 // cout << "aircraft elev = " << aircraftElev * SG_METER_TO_FEET
353 // << " station elev = " << stationElev << endl;
355 if ( nominalRange < 25.0 + SG_EPSILON ) {
356 // Standard Terminal Service Volume
357 return term_tbl->interpolate( alt ) * usability_factor;
358 } else if ( nominalRange < 50.0 + SG_EPSILON ) {
359 // Standard Low Altitude Service Volume
360 // table is based on range of 40, scale to actual range
361 return low_tbl->interpolate( alt ) * nominalRange / 40.0
364 // Standard High Altitude Service Volume
365 // table is based on range of 130, scale to actual range
366 return high_tbl->interpolate( alt ) * nominalRange / 130.0
372 // model standard ILS service volumes as per AIM 1-1-9
373 double FGRadioStack::adjustILSRange( double stationElev, double aircraftElev,
374 double offsetDegrees, double distance )
376 // assumptions we model the standard service volume, plus
378 // altitude difference
379 // double alt = ( aircraftElev * SG_METER_TO_FEET - stationElev );
380 double offset = fabs( offsetDegrees );
383 return FG_ILS_DEFAULT_RANGE;
384 } else if ( offset < 35 ) {
385 return 10 + (35 - offset) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
386 } else if ( offset < 45 ) {
387 return (45 - offset);
388 } else if ( offset > 170 ) {
389 return FG_ILS_DEFAULT_RANGE;
390 } else if ( offset > 145 ) {
391 return 10 + (offset - 145) * (FG_ILS_DEFAULT_RANGE - 10) / 25;
392 } else if ( offset > 135 ) {
393 return (offset - 135);
400 // Update the various nav values based on position and valid tuned in navs
402 FGRadioStack::update(int dt)
404 double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
405 double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
406 double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
410 Point3D aircraft = sgGeodToCart( Point3D( lon, lat, elev ) );
414 ////////////////////////////////////////////////////////////////////////
416 ////////////////////////////////////////////////////////////////////////
419 station = Point3D( nav1_x, nav1_y, nav1_z );
420 nav1_loc_dist = aircraft.distance3D( station );
423 station = Point3D( nav1_gs_x, nav1_gs_y, nav1_gs_z );
424 nav1_gs_dist = aircraft.distance3D( station );
430 geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
431 nav1_loclat, nav1_loclon,
433 // cout << "az1 = " << az1 << " magvar = " << nav1_magvar << endl;
434 nav1_heading = az1 - nav1_magvar;
435 // cout << " heading = " << nav1_heading
436 // << " dist = " << nav1_dist << endl;
439 double offset = nav1_heading - nav1_radial;
440 while ( offset < -180.0 ) { offset += 360.0; }
441 while ( offset > 180.0 ) { offset -= 360.0; }
442 // cout << "ils offset = " << offset << endl;
443 nav1_effective_range = adjustILSRange(nav1_elev, elev, offset,
444 nav1_loc_dist * SG_METER_TO_NM );
446 nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
448 // cout << "nav1 range = " << nav1_effective_range
449 // << " (" << nav1_range << ")" << endl;
451 if ( nav1_loc_dist < nav1_effective_range * SG_NM_TO_METER ) {
453 } else if ( nav1_loc_dist < 2 * nav1_effective_range * SG_NM_TO_METER ) {
454 nav1_inrange = sg_random() <
455 ( 2 * nav1_effective_range * SG_NM_TO_METER - nav1_loc_dist ) /
456 (nav1_effective_range * SG_NM_TO_METER);
458 nav1_inrange = false;
462 nav1_radial = nav1_sel_radial;
465 nav1_inrange = false;
466 // cout << "not picking up vor. :-(" << endl;
469 #ifdef ENABLE_AUDIO_SUPPORT
470 if ( nav1_valid && nav1_inrange ) {
471 // play station ident via audio system if on + ident,
472 // otherwise turn it off
473 if ( nav1_vol_btn > 0.1 && nav1_ident_btn ) {
474 FGSimpleSound *sound;
475 sound = globals->get_soundmgr()->find( "nav1-vor-ident" );
476 if ( sound != NULL ) {
477 sound->set_volume( nav1_vol_btn );
479 SG_LOG( SG_COCKPIT, SG_ALERT,
480 "Can't find nav1-vor-ident sound" );
482 sound = globals->get_soundmgr()->find( "nav1-dme-ident" );
483 if ( sound != NULL ) {
484 sound->set_volume( nav1_vol_btn );
486 SG_LOG( SG_COCKPIT, SG_ALERT,
487 "Can't find nav1-dme-ident sound" );
489 // cout << "nav1_last_time = " << nav1_last_time << " ";
490 // cout << "cur_time = " << globals->get_time_params()->get_cur_time();
491 if ( nav1_last_time <
492 globals->get_time_params()->get_cur_time() - 30 ) {
493 nav1_last_time = globals->get_time_params()->get_cur_time();
496 // cout << " nav1_play_count = " << nav1_play_count << endl;
497 // cout << "playing = "
498 // << globals->get_soundmgr()->is_playing("nav1-vor-ident")
500 if ( nav1_play_count < 4 ) {
502 if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") ) {
503 globals->get_soundmgr()->play_once( "nav1-vor-ident" );
506 } else if ( nav1_play_count < 5 && nav1_has_dme ) {
508 if ( !globals->get_soundmgr()->is_playing("nav1-vor-ident") &&
509 !globals->get_soundmgr()->is_playing("nav1-dme-ident") ) {
510 globals->get_soundmgr()->play_once( "nav1-dme-ident" );
515 globals->get_soundmgr()->stop( "nav1-vor-ident" );
516 globals->get_soundmgr()->stop( "nav1-dme-ident" );
522 ////////////////////////////////////////////////////////////////////////
524 ////////////////////////////////////////////////////////////////////////
527 station = Point3D( nav2_x, nav2_y, nav2_z );
528 nav2_loc_dist = aircraft.distance3D( station );
531 station = Point3D( nav2_gs_x, nav2_gs_y, nav2_gs_z );
532 nav2_gs_dist = aircraft.distance3D( station );
538 geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
539 nav2_loclat, nav2_loclon,
541 nav2_heading = az1 - nav2_magvar;
542 // cout << " heading = " << nav2_heading
543 // << " dist = " << nav2_dist << endl;
546 double offset = nav2_heading - nav2_radial;
547 while ( offset < -180.0 ) { offset += 360.0; }
548 while ( offset > 180.0 ) { offset -= 360.0; }
549 // cout << "ils offset = " << offset << endl;
550 nav2_effective_range = adjustILSRange(nav2_elev, elev, offset,
551 nav2_loc_dist * SG_METER_TO_NM );
553 nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
555 // cout << "nav2 range = " << nav2_effective_range
556 // << " (" << nav2_range << ")" << endl;
558 if ( nav2_loc_dist < nav2_effective_range * SG_NM_TO_METER ) {
560 } else if ( nav2_loc_dist < 2 * nav2_effective_range * SG_NM_TO_METER ) {
561 nav2_inrange = sg_random() <
562 ( 2 * nav2_effective_range * SG_NM_TO_METER - nav2_loc_dist ) /
563 (nav2_effective_range * SG_NM_TO_METER);
565 nav2_inrange = false;
569 nav2_radial = nav2_sel_radial;
572 nav2_inrange = false;
573 // cout << "not picking up vor. :-(" << endl;
576 #ifdef ENABLE_AUDIO_SUPPORT
577 if ( nav2_valid && nav2_inrange ) {
578 // play station ident via audio system if on + ident,
579 // otherwise turn it off
580 if ( nav2_vol_btn > 0.1 && nav2_ident_btn ) {
581 FGSimpleSound *sound;
582 sound = globals->get_soundmgr()->find( "nav2-vor-ident" );
583 if ( sound != NULL ) {
584 sound->set_volume( nav2_vol_btn );
586 SG_LOG( SG_COCKPIT, SG_ALERT,
587 "Can't find nav2-vor-ident sound" );
589 sound = globals->get_soundmgr()->find( "nav2-dme-ident" );
590 if ( sound != NULL ) {
591 sound->set_volume( nav2_vol_btn );
593 SG_LOG( SG_COCKPIT, SG_ALERT,
594 "Can't find nav2-dme-ident sound" );
596 if ( nav2_last_time <
597 globals->get_time_params()->get_cur_time() - 30 ) {
598 nav2_last_time = globals->get_time_params()->get_cur_time();
601 if ( nav2_play_count < 4 ) {
603 if ( !globals->get_soundmgr()->is_playing("nav2-vor-ident") ) {
604 globals->get_soundmgr()->play_once( "nav2-vor-ident" );
607 } else if ( nav2_play_count < 5 && nav2_has_dme ) {
609 if ( !globals->get_soundmgr()->is_playing("nav2-vor-ident") &&
610 !globals->get_soundmgr()->is_playing("nav2-dme-ident") ) {
611 globals->get_soundmgr()->play_once( "nav2-dme-ident" );
616 globals->get_soundmgr()->stop( "nav2-vor-ident" );
617 globals->get_soundmgr()->stop( "nav2-dme-ident" );
623 ////////////////////////////////////////////////////////////////////////
625 ////////////////////////////////////////////////////////////////////////
628 station = Point3D( dme_x, dme_y, dme_z );
629 dme_dist = aircraft.distance3D( station ) * SG_METER_TO_NM;
630 dme_effective_range = kludgeRange(dme_elev, elev, dme_range);
631 if (dme_dist < dme_effective_range * SG_NM_TO_METER) {
633 } else if (dme_dist < 2 * dme_effective_range * SG_NM_TO_METER) {
634 dme_inrange = sg_random() <
635 (2 * dme_effective_range * SG_NM_TO_METER - dme_dist) /
636 (dme_effective_range * SG_NM_TO_METER);
641 SGTimeStamp current_time;
642 station = Point3D( dme_x, dme_y, dme_z );
643 dme_dist = aircraft.distance3D( station ) * SG_METER_TO_NM;
644 current_time.stamp();
645 long dMs = (current_time - dme_last_time) / 1000;
646 // Update every second
648 double dDist = dme_dist - dme_prev_dist;
649 dme_spd = fabs((dDist/dMs) * 3600000);
650 // FIXME: the panel should be able to
654 dme_ete = fabs((dme_dist/dme_spd) * 60.0);
655 // FIXME: the panel should be able to
659 dme_prev_dist = dme_dist;
660 dme_last_time.stamp();
670 ////////////////////////////////////////////////////////////////////////
672 ////////////////////////////////////////////////////////////////////////
675 // staightline distance
676 station = Point3D( adf_x, adf_y, adf_z );
677 adf_dist = aircraft.distance3D( station );
680 geo_inverse_wgs_84( elev, lat * SGD_RADIANS_TO_DEGREES, lon * SGD_RADIANS_TO_DEGREES,
684 // cout << " heading = " << nav2_heading
685 // << " dist = " << nav2_dist << endl;
687 adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
688 if ( adf_dist < adf_effective_range * SG_NM_TO_METER ) {
690 } else if ( adf_dist < 2 * adf_effective_range * SG_NM_TO_METER ) {
691 adf_inrange = sg_random() <
692 ( 2 * adf_effective_range * SG_NM_TO_METER - adf_dist ) /
693 (adf_effective_range * SG_NM_TO_METER);
701 #ifdef ENABLE_AUDIO_SUPPORT
702 if ( adf_valid && adf_inrange ) {
703 // play station ident via audio system if on + ident,
704 // otherwise turn it off
705 if ( adf_vol_btn > 0.1 && adf_ident_btn ) {
706 FGSimpleSound *sound;
707 sound = globals->get_soundmgr()->find( "adf-ident" );
708 if ( sound != NULL ) {
709 sound->set_volume( adf_vol_btn );
711 SG_LOG( SG_COCKPIT, SG_ALERT, "Can't find adf-ident sound" );
714 globals->get_time_params()->get_cur_time() - 30 ) {
715 adf_last_time = globals->get_time_params()->get_cur_time();
718 if ( adf_play_count < 4 ) {
720 if ( !globals->get_soundmgr()->is_playing("adf-ident") ) {
721 globals->get_soundmgr()->play_once( "adf-ident" );
726 globals->get_soundmgr()->stop( "adf-ident" );
731 // marker beacon blinking
732 bool light_on = ( outer_blink || middle_blink || inner_blink );
736 if ( light_on && (current - blink > 400000) ) {
739 } else if ( !light_on && (current - blink > 100000) ) {
744 if ( outer_marker ) {
745 outer_blink = light_on;
750 if ( middle_marker ) {
751 middle_blink = light_on;
753 middle_blink = false;
756 if ( inner_marker ) {
757 inner_blink = light_on;
762 // cout << outer_blink << " " << middle_blink << " " << inner_blink << endl;
766 // Update current nav/adf radio stations based on current postition
767 void FGRadioStack::search()
769 static FGMkrBeacon::fgMkrBeacType last_beacon = FGMkrBeacon::NOBEACON;
771 double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
772 double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
773 double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
775 // FIXME: the panel should handle this
776 // don't worry about overhead for now,
777 // since this is handled only periodically
778 int dme_switch_pos = fgGetInt("/radios/dme/switch-position");
779 if (dme_switch_pos == 0) {
782 } else if (dme_switch_pos == 1) {
783 if (dme_freq != nav1_freq) {
784 dme_freq = nav1_freq;
787 } else if (dme_switch_pos == 3) {
788 if (dme_freq != nav2_freq) {
789 dme_freq = nav2_freq;
797 static string last_nav1_ident = "";
798 static string last_nav2_ident = "";
799 static string last_adf_ident = "";
800 static bool last_nav1_vor = false;
801 static bool last_nav2_vor = false;
803 ////////////////////////////////////////////////////////////////////////
805 ////////////////////////////////////////////////////////////////////////
807 if ( current_ilslist->query( lon, lat, elev, nav1_freq, &ils ) ) {
808 nav1_ident = ils.get_locident();
810 if ( last_nav1_ident != nav1_ident || last_nav1_vor ) {
811 nav1_trans_ident = ils.get_trans_ident();
812 last_nav1_ident = nav1_ident;
813 last_nav1_vor = false;
815 nav1_has_dme = ils.get_has_dme();
816 nav1_has_gs = ils.get_has_gs();
818 nav1_loclon = ils.get_loclon();
819 nav1_loclat = ils.get_loclat();
820 nav1_gslon = ils.get_gslon();
821 nav1_gslat = ils.get_gslat();
822 nav1_elev = ils.get_gselev();
824 nav1_range = FG_ILS_DEFAULT_RANGE;
825 nav1_effective_range = nav1_range;
826 nav1_target_gs = ils.get_gsangle();
827 nav1_radial = ils.get_locheading();
828 while ( nav1_radial < 0.0 ) { nav1_radial += 360.0; }
829 while ( nav1_radial > 360.0 ) { nav1_radial -= 360.0; }
830 nav1_x = ils.get_x();
831 nav1_y = ils.get_y();
832 nav1_z = ils.get_z();
833 nav1_gs_x = ils.get_gs_x();
834 nav1_gs_y = ils.get_gs_y();
835 nav1_gs_z = ils.get_gs_z();
837 #ifdef ENABLE_AUDIO_SUPPORT
838 if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
839 globals->get_soundmgr()->remove( "nav1-vor-ident" );
841 FGSimpleSound *sound;
842 sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
843 sound->set_volume( 0.3 );
844 globals->get_soundmgr()->add( sound, "nav1-vor-ident" );
846 if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
847 globals->get_soundmgr()->remove( "nav1-dme-ident" );
849 sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
850 sound->set_volume( 0.3 );
851 globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
853 int offset = (int)(sg_random() * 30.0);
854 nav1_play_count = offset / 4;
855 nav1_last_time = globals->get_time_params()->get_cur_time() -
857 // cout << "offset = " << offset << " play_count = "
858 // << nav1_play_count
859 // << " nav1_last_time = " << nav1_last_time
860 // << " current time = "
861 // << globals->get_time_params()->get_cur_time() << endl;
864 // cout << "Found an ils station in range" << endl;
865 // cout << " id = " << ils.get_locident() << endl;
867 } else if ( current_navlist->query( lon, lat, elev, nav1_freq, &nav ) ) {
868 nav1_ident = nav.get_ident();
870 if ( last_nav1_ident != nav1_ident || !last_nav1_vor ) {
871 last_nav1_ident = nav1_ident;
872 last_nav1_vor = true;
873 nav1_trans_ident = nav.get_trans_ident();
875 nav1_has_dme = nav.get_has_dme();
877 nav1_loclon = nav.get_lon();
878 nav1_loclat = nav.get_lat();
879 nav1_elev = nav.get_elev();
880 nav1_magvar = nav.get_magvar();
881 nav1_range = nav.get_range();
882 nav1_effective_range = adjustNavRange(nav1_elev, elev, nav1_range);
883 nav1_target_gs = 0.0;
884 nav1_radial = nav1_sel_radial;
885 nav1_x = nav.get_x();
886 nav1_y = nav.get_y();
887 nav1_z = nav.get_z();
889 #ifdef ENABLE_AUDIO_SUPPORT
890 if ( globals->get_soundmgr()->exists( "nav1-vor-ident" ) ) {
891 globals->get_soundmgr()->remove( "nav1-vor-ident" );
893 FGSimpleSound *sound;
894 sound = morse.make_ident( nav1_trans_ident, LO_FREQUENCY );
895 sound->set_volume( 0.3 );
896 if ( globals->get_soundmgr()->add( sound, "nav1-vor-ident" ) ) {
897 // cout << "Added nav1-vor-ident sound" << endl;
899 // cout << "Failed to add v1-vor-ident sound" << endl;
902 if ( globals->get_soundmgr()->exists( "nav1-dme-ident" ) ) {
903 globals->get_soundmgr()->remove( "nav1-dme-ident" );
905 sound = morse.make_ident( nav1_trans_ident, HI_FREQUENCY );
906 sound->set_volume( 0.3 );
907 globals->get_soundmgr()->add( sound, "nav1-dme-ident" );
909 int offset = (int)(sg_random() * 30.0);
910 nav1_play_count = offset / 4;
911 nav1_last_time = globals->get_time_params()->get_cur_time() -
913 // cout << "offset = " << offset << " play_count = "
914 // << nav1_play_count << " nav1_last_time = "
915 // << nav1_last_time << " current time = "
916 // << globals->get_time_params()->get_cur_time() << endl;
919 // cout << "Found a vor station in range" << endl;
920 // cout << " id = " << nav.get_ident() << endl;
926 nav1_trans_ident = "";
927 last_nav1_ident = "";
928 #ifdef ENABLE_AUDIO_SUPPORT
929 if ( ! globals->get_soundmgr()->remove( "nav1-vor-ident" ) ) {
930 // cout << "Failed to remove nav1-vor-ident sound" << endl;
932 globals->get_soundmgr()->remove( "nav1-dme-ident" );
934 // cout << "not picking up vor1. :-(" << endl;
938 ////////////////////////////////////////////////////////////////////////
940 ////////////////////////////////////////////////////////////////////////
942 if ( current_ilslist->query( lon, lat, elev, nav2_freq, &ils ) ) {
943 nav2_ident = ils.get_locident();
945 if ( last_nav2_ident != nav2_ident || last_nav2_vor ) {
946 last_nav2_ident = nav2_ident;
947 last_nav2_vor = false;
948 nav2_trans_ident = ils.get_trans_ident();
950 nav2_has_dme = ils.get_has_dme();
951 nav2_has_gs = ils.get_has_gs();
953 nav2_loclon = ils.get_loclon();
954 nav2_loclat = ils.get_loclat();
955 nav2_elev = ils.get_gselev();
957 nav2_range = FG_ILS_DEFAULT_RANGE;
958 nav2_effective_range = nav2_range;
959 nav2_target_gs = ils.get_gsangle();
960 nav2_radial = ils.get_locheading();
961 while ( nav2_radial < 0.0 ) { nav2_radial += 360.0; }
962 while ( nav2_radial > 360.0 ) { nav2_radial -= 360.0; }
963 nav2_x = ils.get_x();
964 nav2_y = ils.get_y();
965 nav2_z = ils.get_z();
966 nav2_gs_x = ils.get_gs_x();
967 nav2_gs_y = ils.get_gs_y();
968 nav2_gs_z = ils.get_gs_z();
970 #ifdef ENABLE_AUDIO_SUPPORT
971 if ( globals->get_soundmgr()->exists( "nav2-vor-ident" ) ) {
972 globals->get_soundmgr()->remove( "nav2-vor-ident" );
974 FGSimpleSound *sound;
975 sound = morse.make_ident( nav2_trans_ident, LO_FREQUENCY );
976 sound->set_volume( 0.3 );
977 globals->get_soundmgr()->add( sound, "nav2-vor-ident" );
979 if ( globals->get_soundmgr()->exists( "nav2-dme-ident" ) ) {
980 globals->get_soundmgr()->remove( "nav2-dme-ident" );
982 sound = morse.make_ident( nav2_trans_ident, HI_FREQUENCY );
983 sound->set_volume( 0.3 );
984 globals->get_soundmgr()->add( sound, "nav2-dme-ident" );
986 int offset = (int)(sg_random() * 30.0);
987 nav2_play_count = offset / 4;
988 nav2_last_time = globals->get_time_params()->get_cur_time() -
990 // cout << "offset = " << offset << " play_count = "
991 // << nav2_play_count << " nav2_last_time = "
992 // << nav2_last_time << " current time = "
993 // << globals->get_time_params()->get_cur_time() << endl;
996 // cout << "Found an ils station in range" << endl;
997 // cout << " id = " << ils.get_locident() << endl;
999 } else if ( current_navlist->query( lon, lat, elev, nav2_freq, &nav ) ) {
1000 nav2_ident = nav.get_ident();
1002 if ( last_nav2_ident != nav2_ident || !last_nav2_vor ) {
1003 last_nav2_ident = nav2_ident;
1004 last_nav2_vor = true;
1005 nav2_trans_ident = nav.get_trans_ident();
1007 nav2_has_dme = nav.get_has_dme();
1008 nav2_has_dme = false;
1009 nav2_loclon = nav.get_lon();
1010 nav2_loclat = nav.get_lat();
1011 nav2_elev = nav.get_elev();
1012 nav2_magvar = nav.get_magvar();
1013 nav2_range = nav.get_range();
1014 nav2_effective_range = adjustNavRange(nav2_elev, elev, nav2_range);
1015 nav2_target_gs = 0.0;
1016 nav2_radial = nav2_sel_radial;
1017 nav2_x = nav.get_x();
1018 nav2_y = nav.get_y();
1019 nav2_z = nav.get_z();
1021 #ifdef ENABLE_AUDIO_SUPPORT
1022 if ( globals->get_soundmgr()->exists( "nav2-vor-ident" ) ) {
1023 globals->get_soundmgr()->remove( "nav2-vor-ident" );
1025 FGSimpleSound *sound;
1026 sound = morse.make_ident( nav2_trans_ident, LO_FREQUENCY );
1027 sound->set_volume( 0.3 );
1028 globals->get_soundmgr()->add( sound, "nav2-vor-ident" );
1030 if ( globals->get_soundmgr()->exists( "nav2-dme-ident" ) ) {
1031 globals->get_soundmgr()->remove( "nav2-dme-ident" );
1033 sound = morse.make_ident( nav2_trans_ident, HI_FREQUENCY );
1034 sound->set_volume( 0.3 );
1035 globals->get_soundmgr()->add( sound, "nav2-dme-ident" );
1037 int offset = (int)(sg_random() * 30.0);
1038 nav2_play_count = offset / 4;
1039 nav2_last_time = globals->get_time_params()->get_cur_time() -
1041 // cout << "offset = " << offset << " play_count = "
1042 // << nav2_play_count << " nav2_last_time = "
1043 // << nav2_last_time << " current time = "
1044 // << globals->get_time_params()->get_cur_time() << endl;
1047 // cout << "Found a vor station in range" << endl;
1048 // cout << " id = " << nav.get_ident() << endl;
1054 nav2_trans_ident = "";
1055 last_nav2_ident = "";
1056 #ifdef ENABLE_AUDIO_SUPPORT
1057 globals->get_soundmgr()->remove( "nav2-vor-ident" );
1058 globals->get_soundmgr()->remove( "nav2-dme-ident" );
1060 // cout << "not picking up vor1. :-(" << endl;
1064 ////////////////////////////////////////////////////////////////////////
1066 ////////////////////////////////////////////////////////////////////////
1068 if ( current_ilslist->query( lon, lat, elev, dme_freq, &ils ) ) {
1069 if (ils.get_has_dme()) {
1071 dme_lon = ils.get_loclon();
1072 dme_lat = ils.get_loclat();
1073 dme_elev = ils.get_gselev();
1074 dme_range = FG_ILS_DEFAULT_RANGE;
1075 dme_effective_range = kludgeRange(dme_elev, elev, dme_range);
1076 dme_x = ils.get_dme_x();
1077 dme_y = ils.get_dme_y();
1078 dme_z = ils.get_dme_z();
1080 } else if ( current_navlist->query( lon, lat, elev, dme_freq, &nav ) ) {
1081 if (nav.get_has_dme()) {
1083 dme_lon = nav.get_lon();
1084 dme_lat = nav.get_lat();
1085 dme_elev = nav.get_elev();
1086 dme_range = nav.get_range();
1087 dme_effective_range = kludgeRange(dme_elev, elev, dme_range);
1088 dme_x = nav.get_x();
1089 dme_y = nav.get_y();
1090 dme_z = nav.get_z();
1098 ////////////////////////////////////////////////////////////////////////
1100 ////////////////////////////////////////////////////////////////////////
1102 FGMkrBeacon::fgMkrBeacType beacon_type
1103 = current_beacons->query( lon * SGD_RADIANS_TO_DEGREES,
1104 lat * SGD_RADIANS_TO_DEGREES, elev );
1106 outer_marker = middle_marker = inner_marker = false;
1108 if ( beacon_type == FGMkrBeacon::OUTER ) {
1109 outer_marker = true;
1110 // cout << "OUTER MARKER" << endl;
1111 #ifdef ENABLE_AUDIO_SUPPORT
1112 if ( last_beacon != FGMkrBeacon::OUTER ) {
1113 if ( ! globals->get_soundmgr()->exists( "outer-marker" ) ) {
1114 FGSimpleSound *sound = beacon.get_outer();
1115 sound->set_volume( 0.3 );
1116 globals->get_soundmgr()->add( sound, "outer-marker" );
1118 if ( !globals->get_soundmgr()->is_playing("outer-marker") ) {
1119 globals->get_soundmgr()->play_looped( "outer-marker" );
1123 } else if ( beacon_type == FGMkrBeacon::MIDDLE ) {
1124 middle_marker = true;
1125 // cout << "MIDDLE MARKER" << endl;
1126 #ifdef ENABLE_AUDIO_SUPPORT
1127 if ( last_beacon != FGMkrBeacon::MIDDLE ) {
1128 if ( ! globals->get_soundmgr()->exists( "middle-marker" ) ) {
1129 FGSimpleSound *sound = beacon.get_middle();
1130 sound->set_volume( 0.3 );
1131 globals->get_soundmgr()->add( sound, "middle-marker" );
1133 if ( !globals->get_soundmgr()->is_playing("middle-marker") ) {
1134 globals->get_soundmgr()->play_looped( "middle-marker" );
1138 } else if ( beacon_type == FGMkrBeacon::INNER ) {
1139 inner_marker = true;
1140 // cout << "INNER MARKER" << endl;
1141 #ifdef ENABLE_AUDIO_SUPPORT
1142 if ( last_beacon != FGMkrBeacon::INNER ) {
1143 if ( ! globals->get_soundmgr()->exists( "inner-marker" ) ) {
1144 FGSimpleSound *sound = beacon.get_inner();
1145 sound->set_volume( 0.3 );
1146 globals->get_soundmgr()->add( sound, "inner-marker" );
1148 if ( !globals->get_soundmgr()->is_playing("inner-marker") ) {
1149 globals->get_soundmgr()->play_looped( "inner-marker" );
1154 // cout << "no marker" << endl;
1155 #ifdef ENABLE_AUDIO_SUPPORT
1156 globals->get_soundmgr()->stop( "outer-marker" );
1157 globals->get_soundmgr()->stop( "middle-marker" );
1158 globals->get_soundmgr()->stop( "inner-marker" );
1161 last_beacon = beacon_type;
1164 ////////////////////////////////////////////////////////////////////////
1166 ////////////////////////////////////////////////////////////////////////
1168 if ( current_navlist->query( lon, lat, elev, adf_freq, &nav ) ) {
1170 #if defined( _MSC_VER ) || defined(__MINGW32__)
1171 _snprintf( freq, 10, "%.0f", adf_freq );
1173 snprintf( freq, 10, "%.0f", adf_freq );
1176 adf_ident += nav.get_ident();
1177 // cout << "adf ident = " << adf_ident << endl;
1179 if ( last_adf_ident != adf_ident ) {
1180 last_adf_ident = adf_ident;
1182 adf_trans_ident = nav.get_trans_ident();
1183 adf_lon = nav.get_lon();
1184 adf_lat = nav.get_lat();
1185 adf_elev = nav.get_elev();
1186 adf_range = nav.get_range();
1187 adf_effective_range = kludgeRange(adf_elev, elev, adf_range);
1188 adf_x = nav.get_x();
1189 adf_y = nav.get_y();
1190 adf_z = nav.get_z();
1192 #ifdef ENABLE_AUDIO_SUPPORT
1193 if ( globals->get_soundmgr()->exists( "adf-ident" ) ) {
1194 globals->get_soundmgr()->remove( "adf-ident" );
1196 FGSimpleSound *sound;
1197 sound = morse.make_ident( adf_trans_ident, LO_FREQUENCY );
1198 sound->set_volume( 0.3 );
1199 globals->get_soundmgr()->add( sound, "adf-ident" );
1201 int offset = (int)(sg_random() * 30.0);
1202 adf_play_count = offset / 4;
1203 adf_last_time = globals->get_time_params()->get_cur_time() -
1205 // cout << "offset = " << offset << " play_count = "
1206 // << adf_play_count << " adf_last_time = "
1207 // << adf_last_time << " current time = "
1208 // << globals->get_time_params()->get_cur_time() << endl;
1211 // cout << "Found an adf station in range" << endl;
1212 // cout << " id = " << nav.get_ident() << endl;
1217 adf_trans_ident = "";
1218 #ifdef ENABLE_AUDIO_SUPPORT
1219 globals->get_soundmgr()->remove( "adf-ident" );
1221 last_adf_ident = "";
1222 // cout << "not picking up adf. :-(" << endl;
1227 // return the amount of heading needle deflection, returns a value
1228 // clamped to the range of ( -10 , 10 )
1229 double FGRadioStack::get_nav1_heading_needle_deflection() const {
1232 if ( nav1_inrange ) {
1233 r = nav1_heading - nav1_radial;
1234 // cout << "Radial = " << nav1_radial
1235 // << " Bearing = " << nav1_heading << endl;
1237 while ( r > 180.0 ) { r -= 360.0;}
1238 while ( r < -180.0 ) { r += 360.0;}
1239 if ( fabs(r) > 90.0 ) {
1240 r = ( r<0.0 ? -r-180.0 : -r+180.0 );
1246 // According to Robin Peel, the ILS is 4x more sensitive than a vor
1247 if ( nav1_loc ) { r *= 4.0; }
1248 if ( r < -10.0 ) { r = -10.0; }
1249 if ( r > 10.0 ) { r = 10.0; }
1257 // return the amount of heading needle deflection, returns a value
1258 // clamped to the range of ( -10 , 10 )
1259 double FGRadioStack::get_nav2_heading_needle_deflection() const {
1262 if ( nav2_inrange ) {
1263 r = nav2_heading - nav2_radial;
1264 // cout << "Radial = " << nav2_radial
1265 // << " Bearing = " << nav2_heading << endl;
1267 while (r> 180.0) r-=360.0;
1268 while (r<-180.0) r+=360.0;
1269 if ( fabs(r) > 90.0 )
1270 r = ( r<0.0 ? -r-180.0 : -r+180.0 );
1271 // According to Robin Peel, the ILS is 4x more sensitive than a vor
1272 if ( nav2_loc ) r *= 4.0;
1273 if ( r < -10.0 ) r = -10.0;
1274 if ( r > 10.0 ) r = 10.0;
1282 // return the amount of glide slope needle deflection (.i.e. the
1283 // number of degrees we are off the glide slope * 5.0
1284 double FGRadioStack::get_nav1_gs_needle_deflection() const {
1285 if ( nav1_inrange && nav1_has_gs ) {
1286 double x = nav1_gs_dist;
1287 double y = (fgGetDouble("/position/altitude-ft") - nav1_elev)
1289 double angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
1290 return (nav1_target_gs - angle) * 5.0;
1297 // return the amount of glide slope needle deflection (.i.e. the
1298 // number of degrees we are off the glide slope * 5.0
1299 double FGRadioStack::get_nav2_gs_needle_deflection() const {
1300 if ( nav2_inrange && nav2_has_gs ) {
1301 double x = nav2_gs_dist;
1302 double y = (fgGetDouble("/position/altitude-ft") - nav2_elev)
1304 double angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
1305 return (nav2_target_gs - angle) * 5.0;
1313 * Return true if the NAV1 TO flag should be active.
1316 FGRadioStack::get_nav1_to_flag () const
1319 double offset = fabs(nav1_heading - nav1_radial);
1323 return (offset <= 90.0 || offset >= 270.0);
1331 * Return true if the NAV1 FROM flag should be active.
1334 FGRadioStack::get_nav1_from_flag () const
1337 double offset = fabs(nav1_heading - nav1_radial);
1341 return (offset > 90.0 && offset < 270.0);
1349 * Return true if the NAV2 TO flag should be active.
1352 FGRadioStack::get_nav2_to_flag () const
1355 double offset = fabs(nav2_heading - nav2_radial);
1359 return (offset <= 90.0 || offset >= 270.0);
1367 * Return true if the NAV2 FROM flag should be active.
1370 FGRadioStack::get_nav2_from_flag () const
1373 double offset = fabs(nav2_heading - nav2_radial);
1377 return (offset > 90.0 && offset < 270.0);