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Raymarine forum - ST4000 + Autopilot Error

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Calibrated my compass and then my auto pilot worked for about 20 miles. Suddenly I received an error message "RG Fail"; I had to disengage the unit. I cannot find this message in my handbook. Would appreciate your feedback.

Tom Grass
S/V Bucket List
Catalina 320
Welcome to the Raymarine Forum Tom,

Has the ST4000+ been interfaced to a rate gyro (also went by the product names GyroPlus and Pathfinder Smart Heading System)?
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