RT_INS_Pos_LLH_2: INS Longitude and Altitude
RT_INS_Pos_LLH_2: 142, 3 (0x8E0320 + unit id) (0x383)
Bytes 0-3: INS Longitude (degrees)
Bytes 4-7: INS Altitude (m)
Longitude resolution is degrees * 1e-7.
Altitude resolution is m/1000.
Validity is provided by RT_INS_Pos_LLH_1.