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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Compass card with more than 360 degrees
From: Greg B
Date: 2006 Apr 6, 11:45 -0400
From: Greg B
Date: 2006 Apr 6, 11:45 -0400
Lu,
When I first saw the message header:
"Re: Compass card with more than 360 degrees"
I thought someone was going to bring up the Locars(SP?)Compass.
That was a Compass that got some press about 1976 or so - it went from 0
to 400 degrees - to make recprical bearings "easyer" no body got behind
it though, and it went away. FYI: I teach flying & use this neat trick for
reciprical headings:
" The 2 + 2 Methode " :
Example:
If heading is 095 what is the recip?
answer: can you add 2 to the first number and get less than 4?
if so do it and then subtract 2 from the next number the
third number will stay the same....
0 9 5
+2 -2 =
___________
2 7 5
Going back in the other direction recp of 275:
2 7 5
-2 +2 =
________________
0 9 5
It's not fool proof there is a 'dead band' between 000 & 019 degrees
that doesn't work. Try it.
-Greg
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