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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Hand Bearing Compass Deviation
From: David Fleming
Date: 2015 Jun 30, 12:44 -0700
From: David Fleming
Date: 2015 Jun 30, 12:44 -0700
Paul,
The short answer is that is the way of the world.
A light bulb gets dimmer the further you are away from it.
For magnetic fields it depends on the geometry of the source.
For a straight wire, say a power line, fields fall as one over the distance from the wire squared. For a current loop as in an electrical device the fields diminish as one over distance cubed so they get small pretty fast.
Dave F
