RT_Trig_Impact_Pos: Triggered Test Marker Impact Position at Current Trajectory
RT_Trig_Impact_Pos: 141, 19 (0x8D1320 + unit id) (0x353)
Bytes 0-3: Impact Latitude (degrees)
Bytes 4-7: Impact Longitude (degrees)
Latitude resolution is degrees * 1e-7.
Longitude resolution is degrees * 1e-7.
Impact validity is provided by RT_Trig_Lat_Dist_To_Impact.