S/A is not on right now according to my receiver. I do not believe that there is any intention to turn it back on at this time. The DOD does have the option to do so should they believe that an "enemy" poses a threat that would be aided by having access to the full accuracy of the C/A (civilian) code signals.

The GPS system provides an accuracy figure of merit for each satellite, in the broadcast data message. This parameter is called the "URA" or User Range Accuracy. Currently all of the satellites have this parameter set to 2 or 4 meters which is consistant with a typical solution accuracy of ~20 meters. In the past, when S/A was enabled, these URAs were running 16-32 meters. It only provides a rough estimate as it does not take into account receiver performance or atmospheric delays.

Lynn