From: Mike Maurice <mikem@yachtsdelivered.com> Subject: Re: [PUP] RE: Celestial Navigation? (do you need it vs cruise ships)) >In any event, the Government isn't going to just turn GPS off. Almost >everyone in the military uses GPS and is using the same receivers the rest >of us use. Go ask a National Guardsman, which Garmin he is using. Degrade >the signal, very possibly. Turn even the civilian signal clear off, rubbish. I find it interesting that someone as concerned about safety would imply this would NEVER happen. While my experience working on government space systems contracts does not include the technology or the decision loop to shut down GPS having worked with the people who do... does not lead me to the same conclusion. It seems the post 911 approach is shutdown any system that might be used to cause mass destruction before confirming the risk. Do you have some data I do not? On a windly day GPS can be used to direct an object into a facility which houses radiation.... While it is easy to say "Turn even the civilian signal clear off, rubbish" Who would have thought the US would shut down civilian air traffic for days! Each captain uses their knowledge and judgement to make decisions about risk and safety. My experienced would not have me telling everyone that it GPS shutdown is not a risk.