Do not buy the CN-F1D for navigation outside of Japan. Buy it as a retro audio player, a CD ripper, or a dashboard art piece. If you want a Panasonic head unit with navigation in the US, look for the Panasonic Strada CN-NW800T (a different, US-released model).
Panasonic discontinued map updates for the CN-F1D around 2016. No official updates exist. The unit uses SD card-based maps – files unless you have a backup. panasonic strada cn-f1d