Under Pres. Clinton, the "scrambling" code (called "selective availability" by GPS users) was discontinued. Receivers with WAAS were released which were/are accurate to 15 ft. with appropriate differential beacons in place. I haven't read anywhere about selective availability being turned back on, but it would make sense with the current national situation. I have an old Magellan hand-held receiver and I certainly noticed a difference about a week after it was discontinued a couple years ago, but I haven't noticed a decrease in accuracy since...

Nate