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Subject: Re: Newbie - Variation Question
From: Andrew Denman (megnden@XXX.XXX)
Date: Mon Feb 11 2002 - 14:04:09 EST
Pierre,
Thanks for the reply but I am still a little confused. Even if the French
way is to add the negative easterly variation, shouldn't the resultant
magnetic heading be the same as the non French way?
In my case, my compass was reading 305 magnetic, variation is 11 degrees
East at my location. Before adjustment for local magnetic variation, the
GPS was giving me a course relative to true north of 316 degrees true. When
I put in the local variation, rather than the GPS displaying a magnetic
course of 305, it added the 11 degrees easterly variation to give a magnetic
course of 327 degrees magnetic. It would appear that the unit treats the
Easterly variation as positive. When I input the variation as 11 degrees
West, the unit subtracted the variation to give me a magnetic course of 305
degrees, same as the compass.
My other fixed GPS (Garmin) subtracts the Easterly variation to agree with
the compass.
Any other clarification would be appreciated.
Regards,
Andrew Denman
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