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From: (no name) (no email)
Date: Fri Sep 26 2003 - 10:22:23 EDT
Regarding selective availability on GPS, the Interagency GPS Executive Board has a website - http://www.igeb.gov, from which I found the following:
SPECIAL NOTICE
September 17, 2001
GPS Selective Availability (SA) has not been used since its deactivation by the President on May 1, 2000. At that time, the United States Government stated that it has no intent to ever use SA again. There has been no change in this policy.
and
U.S. Policy Statement Regarding Civil GPS Availability
March 21, 2003
The United States Government recognizes that GPS plays a key role around the world as part of the global information infrastructure and takes seriously the responsibility to provide the best possible service to civil and commercial users worldwide. This is as true in times of conflict as it is in times of peace.
The U.S. Government also maintains the capability to prevent hostile use of GPS and its augmentations while retaining a military advantage in a theater of operations without disrupting or degrading civilian uses outside the theater of operations.
We believe we can ensure that GPS continues to be available as an invaluable global utility at all time, while at the same time, protecting U.S. and coalition security requirements.
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My understanding is that rather than turning on selective availability, the strategy would be regional denial rather than global degradation of signal accuracy. Of course, if one happened to be in a region of conflict when service was denied, it would be good to have a viable backup. As always, it is good to maintain an up to date DR plot and use alternate methods to confirm one's position.
John
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