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The Simrad HS80A and MX575D D/GNSS compass solutions are designed to provide reliable heading, ROT (Rate of Turn), and position information to Simrad Autopilots and the MX Series of navigation and AIS transponder systems. These GNSS compasses have enhanced heading and position performance with GPS and GLONASS sensors. The Simrad HS80A and MX575D D/GNSS compasses are type approved to the latest IMO regulations including RAIM (Receiver Autonomous Integrity Monitoring). Both models deliver heading accuracy of better than 0.5° and provide sub-meter DGPS positioning accuracy. This level of accuracy is achieved in the MX575D by using the RTCM correction data supplied from its internal beacon demodulator or from SBAS (Satellite-Based Augmentation System). The HS80A accuracy simply comes from SBAS.