We have a Raymarine inboard pilot with linear drive controlled by the S3g course computer and networked via Seatalk to an e120 plotter. We have developed 2 problems after 5 years of faultless use:

1. For no reason at all the drive disengages despite plenty of battery power and this can happen in all wind and sea conditions both under engine and sail. The system will reset and then do the same thing a few minutes later and that cycle can be repeated many times. It will then work faultlessly for days. It 's irritating, inexplicable and dangerous.

2. More recently, despite full calibration it screws up the heading data regardless of whether that data is coming from the Raymarine Flux Gate or whether it comes from a selected "go to" waypoint.

Anybody any ideas? My guess is that the course computer is the root of the problem. I haven 't tried Raymarine yet because I thought I 'd check out the collective wisdom of the OCC first. Any suggestions gratefully received.