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From: thompson@cactus.org (Charles Thompson)
Subject: How does "Differential Mode" GPS work???
Message-ID: <1993Apr19.001449.17255@cactus.org>
Followup-To: poster
Organization: Capital Area Central Texas UNIX Society, Austin, Tx
Date: Mon, 19 Apr 1993 00:14:49 GMT
Lines: 15



I understand that the new GPS boxes now have an option
known as "differential ready".  Apparently land-based
beacons tranmit GPS correction information to your GPS 
receiver (with differential option installed).

How does this system work?  What frequency is used for
the land-based beacons?

Thanks in advance,

Charlie Thompson
.