To follow up on my last post about the 898 unit freezing up and long beeps.... Apparently the SD card became corrupted somehow while in the unit, I sorta believe it was due to operating the unit while battery voltage fell below the operational level. (Not exactly sure what the exact minimum voltage is for the unit). Anyway, after updating the software, formatting the SD card (16GB) and having a fully charged battery the unit worked like a charm.
Duane