Add some formated frequency outputs to aid panel builders.

src/Instrumentation/navradio.cxx

@@ -57,6 +57,8 @@ FGNavRadio::FGNavRadio(SGPropertyNode *node) :
     audio_btn(true),
     nav_freq(0.0),
     nav_alt_freq(0.0),
+    fmt_freq(""),
+    fmt_alt_freq(""),
     nav_heading(0.0),
     nav_radial(0.0),
     nav_target_radial(0.0),
@@ -161,6 +163,14 @@ FGNavRadio::bind ()
            &FGNavRadio::get_nav_alt_freq, &FGNavRadio::set_nav_alt_freq);
     fgSetArchivable( (branch + "/frequencies/standby-mhz").c_str() );
 
+    fgTie( (branch + "/frequencies/selected-mhz-fmt").c_str() , this,
+	  &FGNavRadio::get_fmt_freq, &FGNavRadio::set_fmt_freq );
+    fgSetArchivable( (branch + "/frequencies/selected-mhz-fmt").c_str() );
+
+    fgTie( (branch + "/frequencies/standby-mhz-fmt").c_str() , this,
+           &FGNavRadio::get_fmt_alt_freq, &FGNavRadio::set_fmt_alt_freq);
+    fgSetArchivable( (branch + "/frequencies/standby-mhz-fmt").c_str() );
+
     fgTie( (branch + "/radials/selected-deg").c_str() , this,
            &FGNavRadio::get_nav_sel_radial, &FGNavRadio::set_nav_sel_radial );
     fgSetArchivable((branch + "/radials/selected-deg").c_str() );
@@ -344,6 +354,14 @@ FGNavRadio::update(double dt)
     Point3D station;
     double az1, az2, s;
 
+    // Create "formatted" versions of the nav frequencies for
+    // consistant display output.
+    char tmp[16];
+    sprintf( tmp, "%.2f", nav_freq );
+    fmt_freq = tmp;
+    sprintf( tmp, "%.2f", nav_alt_freq );
+    fmt_alt_freq = tmp;
+
     // On timeout, scan again
     _time_before_search_sec -= dt;
     if ( _time_before_search_sec < 0 ) {

src/Instrumentation/navradio.hxx

@@ -73,6 +73,8 @@ class FGNavRadio : public SGSubsystem
     bool nav_loc;
     double nav_freq;
     double nav_alt_freq;
+    string fmt_freq;            // formated frequency
+    string fmt_alt_freq;        // formated alternate frequency
     double nav_heading;         // true heading to nav station
     double nav_radial;          // current radial we are on (taking
                                 // into consideration the vor station
@@ -152,7 +154,9 @@ public:
     inline void set_nav_freq( double freq ) {
 	nav_freq = freq; need_update = true;
     }
+    inline void set_fmt_freq( const char *freq ) { fmt_freq = freq; }
     inline void set_nav_alt_freq( double freq ) { nav_alt_freq = freq; }
+    inline void set_fmt_alt_freq( const char *freq ) { fmt_alt_freq = freq; }
     inline void set_nav_sel_radial( double radial ) {
 	nav_sel_radial = radial; need_update = true;
     }
@@ -170,9 +174,13 @@ public:
     inline bool get_power_btn() const { return power_btn; }
     inline bool get_audio_btn() const { return audio_btn; }
 
-   // NAV Accessors
+    // NAV Accessors
     inline double get_nav_freq () const { return nav_freq; }
+    inline const char *get_fmt_freq () const { return fmt_freq.c_str(); }
     inline double get_nav_alt_freq () const { return nav_alt_freq; }
+    inline const char *get_fmt_alt_freq () const {
+        return fmt_alt_freq.c_str();
+    }
     inline double get_nav_sel_radial() const { return nav_sel_radial; }
     inline double get_nav_target_radial() const { return nav_target_radial; }
     inline double get_nav_target_radial_true() const {