heightRef          31 core/gps.h         char    heightRef[4];
heightRef          46 core/gps.h         char    heightRef[4];
heightRef          56 core/gps_simulate.c         strcpy(gps_dummy_data.heightRef,   "n/a") ;   // not used
heightRef         257 modules/dng.c      {0x0005, T_BYTE|T_PTR,        1,  (int)&gps_data.heightRef},      //AltitudeRef