NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Deviation Card with GPS
From: hellos
Date: 2006 Jul 29, 14:35 -0500
Gary, marine compasses do the same thing.
I am guessing that the compass reads deviation versus time (the rate of turn
must be constant) and then it "remembers" the min/max and when the pattern
repeates itself. Something in the pattern must be perceived as "most north" and
from there, you just need to note the other readings versus time, i.e. halfway
between "most north" readings would have been south, etc. and you divvy those up
into a lookup table.
Just guessing. Maybe they've got something simpler and more elegant.
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To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
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From: hellos
Date: 2006 Jul 29, 14:35 -0500
Gary, marine compasses do the same thing.
I am guessing that the compass reads deviation versus time (the rate of turn
must be constant) and then it "remembers" the min/max and when the pattern
repeates itself. Something in the pattern must be perceived as "most north" and
from there, you just need to note the other readings versus time, i.e. halfway
between "most north" readings would have been south, etc. and you divvy those up
into a lookup table.
Just guessing. Maybe they've got something simpler and more elegant.
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
