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    Re: GPS backup/emergency navigation
    From: Russell Sher
    Date: 1998 Nov 27, 01:47 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{at}XXX.XXX]
    > Sent:	Friday, November 27, 1998 4:04 AM
    > To:	Rick Emerson; navigation{at}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{at}XXX.XXX>
    > To: navigation{at}XXX.XXX>
    > Cc: Mark Anderson <andermar{at}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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