NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GPS backup/emergency navigation
From: Russell Sher
Date: 1998 Nov 27, 01:47 EST
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@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 > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-= > =-= TO UNSUBSCRIBE, send this message to majordomo@XXX.XXX: > =-= > =-= navigation > =-= > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-= =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-= =-= TO UNSUBSCRIBE, send this message to majordomo@XXX.XXX: =-= =-= navigation =-= =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=