While most of you probably carry an all-in-one NAV with a built-in GPS receiver, the MG-920 is designed to connect to Bluetooth navigation systems that need a little help syncing with satellites, and although the SiRF Star III LP chip and rechargeable Li-ion cell are entirely average, the bottom-mounted FM transmitter allows a turn-by-turn instructor to be channeled to one's FM radio.

ENGADGET: Mainnav MG-920 Bluetooth GPS receiver touts FM transmitter