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Subject: Re: Variation of compass
From: David Weilacher (daveweilacher@XXX.XXX)
Date: Wed Oct 02 2002 - 17:04:50 EDT
One thing I attempted was to compute compass variation by assuming a GP for
the mag north pole of 82N x 108W then doing a sight reduction to obtain
azimuth (Zn).
Ended up deciding there were two problems with this; both biggies.
First, it ignores the earths own magnetic anomolies. No help for this.
Second, it gives me an initial great circle bearing when I suspect what I'm
really after is a rhumbline bearing.
BTW, it yielded a reasonable answer from Florida, but was whacko for Bermuda
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