I'm curious. Capt Caper stated that 51 and 48 are in test mode. Can anyone tell us what that means for us? Will the D's be on and off while testing occurs, or will our GPSr's show D's without actually being more accurate? Or will our GPSr's try to use "test" data and be less accurate? After the update, my 76CSx seems to wander less while stationary, but it tracks to the side of roads rather than on them (I only have US Topo at the moment). EPE does seem to have reduced, on average, from 18-20ft to 8-12ft.