NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: sight reduction with GPS receiver
From: Doug Royer
Date: 2005 Mar 18, 16:59 -0800
From: Doug Royer
Date: 2005 Mar 18, 16:59 -0800
Paul Hirose has surely found the most sophisticated way of landing in the reefs with the combined assistance of GPS _and_ a sextant! LMAO! Not at Mr. Hirose but at the above cynical,but I believe true,review of the procedure. A GPSreceiver normally shows distance between two points along the geodesic. Yes. I don't know of any h.h. gps units that have gc datums in the software.I may be wrong on this and if so would appreciate being shown a model that does. In order to use your GPS receiver as a makeshift sightreduction computer, you have to cajole it into using a spherical earth model. So very true. n some models this is not a trivial task - if possible at all. (To say nothing of the practical aspect of making sure that a GPS receiver that has been upset in such a fashion does not end up in the nav station by mistake, quasi as a time bomb ready to explode at the moment of landfall. But practical aspects hardly play any role in this discussion.) Herbert Prinz Paul Hirose wrote: >There are other ways a GPS receiver can assist with traditional >navigation. For example, let's try a sight reduction. >