RT_INS_Lon_Dist_To_End_Mark: INS Longitudinal Time and Distance to End Marker Impact
RT_INS_Lon_Dist_To_End_Mark: 142, 30 (0x8E2420 + unit id) (0x3A4)
Bytes 0-3: Longitudinal time to end marker impact (s)
Bytes 4-7: Longitudinal distance to end marker impact (m)
Time to impact resolution is s/1000.
Distance to impact resolution is m/1000.
Validity and impact flags are provided by RT_INS_Lat_Dist_To_End_Mark.