Just paid the Dealer $125.00 ; they failed to get clock and / or Maps-GPS-Navibation to re-set . The battery had lost all power (my fault as I left a light on} . New Battery installed . Still no clock or GPS . Disconnected battery for 1 hour . No solution . Dealership checked Codes etc ; no re-set .Now what ? New Antenna , new GPS unit , new Clock ...?? Could it be a re-chargeable small battery which keeps Time on clock accurate when main 12 V Car Battery is changed ? Puzzled .