I run the same system in a 2188. It was factory installed. It has a DG with the arrow when it's logging. In your setup menu, are you set to log to a 1M card. Check that. My setting all went screwy today out of the blue. Had to reset Box cal. If you're set to log and you don't have a DG, I'd suspect there is something wrong with the satellite receiver system. If you have the Trimble they can go screwy too. let us know what you find.