Alignment Issues with Radar Overlay?

Question:

I recently installed a complete Raymarine navigation package, which includes an E80, 4kW radar, ST60+ instruments, and an S1 autopilot. The radar overlay-onto-chart feature is one of the main reasons I upgraded my whole navigation system. Frustratingly, the radar overlay doesn't always align with the chart, even though I've tried calibrating numerous times. What is going on here?

Answer:

Hi Mark,

The problem you described is easily solved with a gyroscopic sensor (or Gyro for short). Currently your radar overlay misalignment happens because your magnetic flux compass is not able to compensate for your boats pitch and yaw. A gyro unit does just that and allows for a significantly better synchronization between chart and radar on your E80. Raymarine sells a Gyroplus II unit (Raymarine product #E12101) that can easily be added to your existing S1 autopilot.

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