From: zulu@cix.compulink.co.uk ("Steve Delanghe")
Subject: Re: TECH: GPS in helmet tracking?
Date: Tue, 2 Apr 1996 16:02:17 GMT
Message-ID: <Dp8sJt.FHp@cix.compulink.co.uk>


> My understanding is that the military have
> much higher resolution systems, but we (the general public) cannot
> access them.

I believe the military systems are called *differential* GPS. AFAIK,
the GPS info is routed to a local receiver in a known location, which
compares the GPS info with a detailed local map, calculates the
difference (don't ask me how), and relays the amended info to the
mobile receiver.

Steve
zulu@cix.compulink.co.uk