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 *  acm : an aerial combat simulator for X
 *  Copyright (C) 1991,1992  Riley Rainey
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 dated June, 1991.
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  GNU General Public License for more details.
 *  You should have received a copy of the GNU General Public License
 *  along with this program;  if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave., Cambridge, MA 02139, USA.
typedef struct {
      double      latitude;
      double      longitude;
      double      altitude_msl;
      }     location_t;

typedef unsigned short  freq_t;

typedef struct _navaid_t {
      struct _navaid_t *next;       /* links navaids on the same channel */
      char        id[4];            /* identifier (e.g. "IHNL") */
      freq_t            frequency;  /* channel number */
      unsigned short    flags;
      location_t  loc;        /* lat/long/altitude */
      location_t  gs_loc;           /* lat/long/altitude of glide-slope*/
      double            bearing;    /* orientation wrt true north(x axis) */
      double            beam_width; /* beam width for localizers */
                              /*see navaid.c on how to calculate it*/
      double            slope;            /* angle of glide slope */ 
      VPoint            Sg;         /* cartesian location */
      VPoint            gs_Sg;            /* cartesian location */
      VMatrix           gst;        /* transform world to gs coordinates */
      }           navaid_t;

typedef struct {
      freq_t      frequency;        /* active frequency */
      freq_t      standby_frequency;      /* alternate frequency */
      short obs_setting;            /* omni bearing selector setting */
      char  dme_readout[16];  /* Current DME reading */
      char  freq_readout[8];  /* current printable freq */
      navaid_t *station;            /* station being received */
      }     radio_t;

#define VOR_CHANNEL_COUNT     180

 *  Definition of the navaid flag word

#define NAVAID_LOC      0x0001
#define NAVAID_VOR      0x0002
#define NAVAID_DME      0x0004
#define NAVAID_GS 0x0008
#define NAVAID_MARKER   0x0010
#define NAVAID_NDB      0x0020

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