NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
FW: Mag. Variation
From: Doug Royer
Date: 2004 Feb 24, 10:47 -0800
From: Doug Royer
Date: 2004 Feb 24, 10:47 -0800
-----Original Message----- From: Royer, Doug Sent: Tuesday, February 24, 2004 10:46 To: 'dhhogan1@EARTHLINK.NET' Subject: RE: Mag. Variation Dan,I understand what you are conveying.Keiran came up with a procedure that Gregory used to find variation in Australian outback in the 1800's.Just variation,not error.I can't explain the math behind it and that is what he requires. I don't know how Mag. Variation was calculated, if it was, in the17th and 18th centuries. But I was tutored by a Merchant Marine Captain from the days when they had to supply their own navigation supplies, He used "Compass Error", the difference between the calculated azimuth of the body and the compass bearing of the body. He did not plot on charts, but calculated his position.and marked that on the chart. Dan Hogan dhhogan1@earthlink.net