NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Is this quite the thing or not?
From: Rodney Myrvaagnes
Date: 2002 Nov 5, 15:29 -0500
From: Rodney Myrvaagnes
Date: 2002 Nov 5, 15:29 -0500
Furuno also has a GPS compass. They can certainly replace a gyrocompass. The carrier-phase computations get the bearing from one antenna to the other with much closer spacing of anntennae than would otherwise be needed. It is easy to see how a pair of cheap GPS receivers at opposite ends of a supertanker could be used to tell the heading. BTW, there is a lot more redundancy in the sattelite system than in two receivers. You can usually see more than twice as many satts as you need for a 3D fix. On Tue, 5 Nov 2002 11:30:02 -0800, Dan Allen wrote: >Simrad has a new product with two GPS receivers in one instrument for >added redundancy. Of course if the GPS system goes down this >redundancy does nothing for you. > >Anyway, here is their simple description of the device: what does the >group think of it? Are their claims justified? Does anyone know what >it is doing -- the carrier phase data? In the spirit of having >multiple ways of tracking your position (GPS, dead reckoning, celestial >nav), it may be a big step backwards as it claims to replace a >gyrocompass. It is this aspect that I am particularly interested in. > Rodney Myrvaagnes J36 Gjo/a "Never stand behind a sneezing cow." Michael Perry