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Subject: RE: [Nml] Re: GPS backup/emergency navigation
From: Russell Sher (rsher@XXX.XXX)
Date: Fri Nov 27 1998 - 01:47:38 EST
Denis - you can get Bowditch from the web, verbatim at this address...
http://www.nima.mil/Navigation/bowditch/
Enjoy
Russell
> -----Original Message-----
> From: Denis Gutar [SMTP:denisg@XXX.XXX]
> Sent: Friday, November 27, 1998 4:04 AM
> To: Rick Emerson; navigation@XXX.XXX
> Cc: Mark Anderson
> Subject: Re: [Nml] Re: GPS backup/emergency navigation
>
> 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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