NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Deviation plot
From: John LeRoy
Date: 2002 Feb 5, 09:18 +0000
From: John LeRoy
Date: 2002 Feb 5, 09:18 +0000
on 2/4/02 12:47 PM, Chuck Taylor at ctaylor@PREMIER1.NET wrote: > The documentation for my Garmin Etrex Mariner GPS defines the following data > items: > > Bearing - The direction from your current location to a destination. > > Course - The direction from your starting location to a destination. > > Heading - Your moving direction. > Unfortunately the guy who wrote the manual is wrong. Actually your moving direction is track, sometime called course made good (CMG.) The GPS can't possibly know what your heading is, which might vary from your track by 20 degrees or more crossing the Mississippi in a slow boat in the spring. The guy that wrote the manual was thinking of a car. Unless you are in Wisconsin in the winter, on black ice, your heading will be your track, but not in an airplane or boat. John LeRoy M/V Traveller
