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Default Autopilot fails on Raytheon ST5000+ with "No Data" error

Hello, I have a 38ft (11.5m) sailing cruiser with a Raytheon ST5000+
autopilot, Raytheon radar/chart plotter with Wind, Depth, Speed, GPS,
fluxgate compass, etc.
The autopilot works only when travelning west. Attempting to calibrate
the system always fails at the "Turn Boat" phase with a "Too Fast"
error even thou I've done the turn dozens of times exactly by the
book. The ST5000+ compass heading is wildly inaccurate. As the boat
turns the ST5000+ compass display jumps in large increments rather
than smoothly as I would expect.
Tying the autopilot in any direction other than West results in a
change of direction or a "No Data" error.
Any ideas?

Many thanks, Donagh.