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I realise that this is an odd question, What do you want the compass for?
Electronics are only as good as the state of the batteries, Some years ago I crewed a 40ft yacht across Bass Strait, unbeknown to us at the time the owner was using a GPS as the sole form of navigation (he even failed to keep a running log), needless to say it lost power, we were fortunate that the weather was kind and were able to use some basic Coastal Nav, a compass and the lights on King Island and Cape Otway light to get us to Melbourne.
Compasses are so the future.(mine anyway)
Greg.
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