GHRS1 HEADING SENSORPITCH-PERFECT. For optimum steering control, stabilize your autopilot, radar and chartplotter with Geonav's solid-state, three-axis heading sensor. Compatible with the MID 110 Multi-Instrument Display , the GHRS1 combines a digital compass, three-axis accelerometer and Rate Gyro to achieve one to two degrees of dynamic heading accuracy, even in the roughest of seas. Rapid, 10Hz update rate ensures exceptional dynamic position reference performance.