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Subject: Re: [Nml] Re: GPS backup/emergency navigation
From: Denis Gutar (denisg@XXX.XXX)
Date: Thu Nov 26 1998 - 21:04:04 EST
Would anyone please scan these 3 or 4 pages from Bowditch for us the
arnchair navigators?
-----Original Message-----
From: Rick Emerson <rick@XXX.XXX>
To: navigation@XXX.XXX>
Cc: Mark Anderson <andermar@XXX.XXX>
Date: November 25, 1998 10:57 AM
Subject: [Nml] Re: GPS backup/emergency navigation
>A friend wrote the following comments in response to a discussion
>about the need for sight reductions with the Nautical Almanac and
>sight reduction tables of some sort (e.g., HO 249) versus doing the
>reductions by solving the navigation triangle "by hand".
>
>[...]
> > No you don't, i.e. need an almanac or HO 249. Well, you need an
almanac,
> > but the perenial one in Bowditch that's about 3 or 4 pages long will
> > suffice for the sun and stars. It's based on the fact that the almanac
> > nearly repeats every 4 yrs. and a fudge factor is added. A few basic
trig
> > formulas and you don't need 249
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