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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Variation of compass
From: Michael Wescott
Date: 2002 Oct 3, 13:25 -0400
From: Michael Wescott
Date: 2002 Oct 3, 13:25 -0400
daveweilacher@EARTHLINK.NET said:
> 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.
Great circle is what you want, much the same as a fix on a radio beacon.
--
Mike Wescott
Wescott_Mike@EMC.COM
