Subject: Re: GPS and birding
Date: Jan 16 20:08:29 1998
From: Rob Saecker - rsaecker at thurston.com


At 2:26 PM -0900 1/16/98, Andrew Sorensen wrote:
>I have heard that for a period of time every day (anywhere from 15 minutes
>up to an hour), the military completely scrambles the GPS system, and that
>during this period, your GPS readings are off by a considerable amount.
>And, this can happen any time of the day as it isn't a scheduled event.

As I understand it, the military introduces a variable error of up to 30
meters into the GPS signal, and does it continuously. But I've been wrong
on this subject before, so I leave final word to the experts.

Rob Saecker
Olympia