New reply from Bob Garrett
First question is where is your fluxgate compass? Is it perhaps near the cables from the engine to the battery? Maybe if your batteries are low in charge the engine is sending a lot more current than usual? Maybe you have been under sail or at anchor a lot?
Original Post by Simon Martin
More autohelm woes – engine appears to be interfering
<p>when the engine is running, the heading on the autohelm seems to be disturbed: it shows 242 degrees (+- a few degrees, so it is not fixed) when the boat is heading west, irrespective of actual heading or course, 70 degrees +- a few) when heading east. When I switch the engine off eg sailing, the reading on the autohelm is right again </p>
<p>I assume that this is some kind of interference – shielding or something. It is odd because the problem has only just happened- everything was fine a week ago. Has anyone experienced this? Any ideas how to fix it?</p>
<p>thanks, Simon </p>