|
[DPRG] digital compass in my car went crazy in Canada
Subject: [DPRG] digital compass in my car went crazy in Canada
From: Dave Hylands
dhylands at gmail.com
Date: Wed May 21 16:10:51 CDT 2008
> > Hi David, I noted a reading bias towards east until well south of the Canadian
> > border. So I was heading due S but the compass kept reading SE. I wonder how
> > these devices work in Canada? Maybe they only sell them with a GPS receiver.
Here's a good picture that shows the declination for various
geographic locations:
<http://en.wikipedia.org/wiki/Image:IGRF_2000_magnetic_declination.gif>
(obtained from this page: <http://en.wikipedia.org/wiki/Geomagnetism>
My interpretation of this is that anywhere along one of the lines will
give the difference between magnetic north and true north.
So you can see 10 degrees of difference between southern California
and Vancouver, BC
--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/
More information about the DPRG mailing list
|
