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To: DaveMG who wrote (13113)	7/29/1998 4:28:00 PM
From: Steve Hamilton	Respond to of 152472

Yes, up to three sattelites at a time our tracked by one GPSR (GPS Receiver). Also, if the satellites all blow up, the GPSR can clock for 24 hours minimum. SH

To: DaveMG who wrote (13113)	7/29/1998 5:12:00 PM
From: Clarksterh	Respond to of 152472

Dave - <Why is GPS so vulnerable.> It isn't particularly vulnerable from a technical standpoint. But, to take Ericsson's position, it might be that CDMAOne is using the high accuracy GPS signal (I don't actually know which signal they use), and during a war the US decides to re-encrypt it. Or imagine that India's telecomm was heavily dependent on GPS timing, and the US decided to get really serious about sanctions. Bang go much of India's telecom capacity. I am not saying that using GPS is right or wrong, only that it is more of a political/philosophical decision. Clark