I use a Magellan 300M with WAAS accuracy built in. Today I had a chance to check it out and it was right on the money on the Chesapeake Bay near Annapolis. I have two units. The other is a Garmin 76 and it is in agreement to a couple of thousands with the Magellan. I was also wondering if post 911 the military had started degrading the signal again. It look like they haven''t. Anybody else have any info?