Since the 825 is a "Nav3" generation device, it still has a rudimentary satellite survey available.
While in a clear sky (outdoors), under "Settings", go to "Connections" and then "GPS status". As dhn recommends, wait a few minutes out there (as many as 12 minutes), and see whether the device shows anything more than the single little yellow circle at the north end of the compass, or whether other satellites appear.