AP_Hott_Telem: fixed GPS display for mz-32

thanks to Ralf Helbing

libraries/AP_Hott_Telem/AP_Hott_Telem.cpp

@@ -208,7 +208,7 @@ void AP_Hott_Telem::send_GPS(void)
         uint16_t climbrate;           //#24 m/s 0.01m/s resolution. Value of 30000 = 0.00 m/s
         uint8_t climbrate3s;          //#26 climbrate in m/3s resolution, value of 120 = 0 m/3s
         uint8_t gps_satelites;        //#27 sat count
-        uint8_t free_char3;           //#28 ???
+        uint8_t gps_fix_char;         //#28 GPS fix character. display, 'D' = DGPS, '2' = 2D, '3' = 3D, '-' = no fix
         uint8_t home_direction;       //#29 direction from starting point to Model position (2 degree steps)
         int16_t vel_north;            //#30 velocity north mm/s
         uint8_t speed_acc;            //#32 speed accuracy cm/s
@@ -220,7 +220,7 @@ void AP_Hott_Telem::send_GPS(void)
         uint8_t horiz_acc;            //#39 horizontal accuracy
         uint8_t free_char1;           //#40 displayed to right of home
         uint8_t free_char2;           //#41
-        uint8_t gps_fix_char;         //#42 GPS fix character. display, 'D' = DGPS, '2' = 2D, '3' = 3D, '-' = no fix
+        uint8_t free_char3;           //#42 GPS fix character. display, 'D' = DGPS, '2' = 2D, '3' = 3D, '-' = no fix
         uint8_t version = 1;          //#43 0: GPS Graupner #33600, 1: ArduPilot
         uint8_t stop_byte = 0x7d;     //#44
     } msg {};
@@ -287,6 +287,7 @@ void AP_Hott_Telem::send_GPS(void)
         msg.gps_fix_char = '3';
         break;
     }
+    msg.free_char3 = msg.gps_fix_char;
 
     msg.home_direction = degrees(atan2f(home_vec.y, home_vec.x)) * 0.5 + 0.5;