NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Annual Increase of Variation
From: Dave Weilacher
Date: 2002 Feb 13, 07:40 -0500
From: Dave Weilacher
Date: 2002 Feb 13, 07:40 -0500
It is my understanding that the magnetic north pole lives at somewhere around 75 north by 95 west; this being the area that most compasses point to. (except french ones I'm told). The "pole" is moving west approx 1 degree of longitude per year. Longitude where we are is pretty fat compared to 75 north plus a 1 degree change in longitude that far away makes for a very small great circle correction to us. I would still like to know if there is a geographical position of the pole that I could use to reduce a variation. Original Message: ----------------- From: Richard Pinkowitz richpink@WORLD.STD.COM Date: Tue, 12 Feb 2002 07:41:57 -0500 To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM Subject: [NAV-L] Annual Increase of Variation Everyone: What is the cause of the "annual" portion of the magnetic variation on the compass rose? Although this "annual variation" is listed for my area of the US, Massachusetts, as about 1' - 3' this has not been recognized in the "total magnetic variation" in the charts we have used over the past 20 years. At 3' per year we would have seen a 1 degree change in variation over the past 20 years. Is this annual variation in a constant direction or does it oscillate? Answers would be appreciated so that I could respond to the navigation class. Rich Pinkowitz -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .