jetpilot12

Swing it with all the avionics on. Like it would be in flight ... iPad on etc ... Level ground is important.

We installed that Precusion Vertical Card Compass, thinking it would be better than than wet compass, which our mechanic had just overhauled.

Mmmmm ... it's ok, but not perfect. Not cheap to buy either ...

the directions are pretty easy swinging the precision.  ... It gave us trouble. We got those balance balls. Those made it worse (which surprised us after reading Chris's "Maurauder" reviews) so we took them back off ... We got better results without them.

if you decide you need those Balance balls, don't buy them, I'll give you ours (free) ...

there are threads about this, and demagnetizing the airframe - too much trouble and expense if you ask me.

David