Xref: utzoo rec.boats:1036 sci.space.shuttle:1781 rec.aviation:10349
Path: utzoo!yunexus!geac!syntron!jtsv16!uunet!axecore!lloyd
From: lloyd@axecore.UUCP (Lloyd Buchanan)
Newsgroups: rec.boats,sci.space.shuttle,rec.aviation
Subject: Re: NAVSTAR
Message-ID: <172@axecore.UUCP>
Date: 26 Oct 88 13:39:14 GMT
Article-I.D.: axecore.172
References: <test5@herron.uucp> <1736@nunki.usc.edu>
Reply-To: lloyd@axecore.UUCP (Lloyd Buchanan)
Organization: Axe Core, Tarrytown NY
Lines: 10


I presume NAVSTAR works as a variant of the same hyperbolic radionavigation
as LORAN.  This means that a receiver can only determine its position in 
relation to the transmitters.  LORAN is no problem as the transmitters
are in fixed, known positions.

Since the satelites are not in geostationary orbits they must
broadcast their positions to the receivers.  Presumably they broadcast 
two positions, one for civilians and one more accurate but encrypted version
for the military.