[Yogie-One (Paul)]

For what it's worth, I recently bought a Digital Compas (via Ebay) It didn't cost the earth. At a reasonable cost, it digitally displays to fraction of a degree. When I use mine, I view the telescope from a distance, and line North up with a distant object, with the scope in between. Thus no effect from any close metal. I then line the scope up on the distand object, which is North from the scope.