RT_Trig_Direct_Dist_To_Marker: Triggered Test Direct Time and Distance to Marker
RT_Trig_Direct_Dist_To_Marker: 141, 18 (0x8D1220 + unit id) (0x352)
Bytes 0-3: Direct time to marker centre (s)
Bytes 4-7: Direct distance to marker centre (m)
Time to marker resolution is s/1000.
Distance to marker resolution is m/1000.
Validity and impact flags are provided by RT_Trig_Lat_Dist_To_Impact.