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    Re: GPS backup/emergency navigation
    From: Denis Gutar
    Date: 1998 Nov 26, 21:04 EST

    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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