Neptune G2 provides the accurate and comprehensive motion measurement data for various aircrafts. It has two modes: GNSS/INS and AHRS/DR. When the GNSS signal is effective, the system will shift to GNSS/INS mode, providing accurate data of position, velocity, attitude, etc. When the GNSS signal is invalid, it will shift to AHRS/DR mode automatically. Neptune G2 contains the function of dead reckoning attitude heading reference.