So all of that leads you to the conclusion that magnetic compasses should be mandatory for helicopters, and those compasses should be the subject of mandatory periodic calibrations by licensed aircraft maintenance engineers, on pain of criminal prosecution?
If so, like I said, it's no wonder the GA community is such easy pickings for the regulator.
(As a matter of interest, Sunny, when was your yacht's Sestrel magnetic compass last calibrated by a licensed compass adjuster? When is it next due for a mandatory calibration? What penalty do you face if you go to sea without your yacht's compass having been calibrated by a licensed compass adjuster?)