I forgot to say that I also removed the magnet from the bottom of the ADSB aerial or it will do nasty things to the magnetic compass.
Do check before you fly that noting in your fit affects the compass it is an easy mistake to make!
Graham,
This point has been made several times on the forum and you are right to remind us yet again.
If fitting
any new electronic equipment - (any of which might generate a magnetic field when powered up), or anything known to containing magnets - anywhere near your compass, it is
essential to check your compass direction
before and after fitting and with the new equipment powered up to make sure that it has not affected your compass bearing.
I found this out the hard way several years ago, when I powered up my shiny new (at the time) GPS in the air only to see my compass veer by over 20 degrees from its previous direction. OK it was a GPS, so kind of made the compass redundant (at least until it failed), but the principle still stands. The answer in my case was to move the compass up onto my front strut well away from all my electrics, but this is of course not always possible.
Regards
Peter