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Great, thanks, that just about settles it for me. I think I'll keep this
exchange for future reference in case I ever get thrown off the track
(excuse the pun).

Christian Scheele


----- Original Message -----
From: "glapook@pacbell.net" 
To: "NavList" 
Sent: Friday, June 12, 2009 6:42 PM
Subject: [NavList 8640] Re: A-10 Sextant Manual



It's really not a problem since the navigator always has to compute
the azimuth for every shot. This means that he always knows what the
azimuth is (and thereby the direction the the LOP runs) since he
computes it based on the time of the sights and the location of his
AP  Since he chooses an AP near his DR (presumably not for from his
actual position) is accurate enough to plot the LOP and find the
destination. You can compute some trial cases and see for yourself how
much he azimuth varies. An easy way to see this is to just glance at
the various entries in precomputed tables such as H.O. 214, H.O. 229,
H.O. 249 etc.

gl



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