DeLorme Blue Logger

Not much bigger than a fun-size candy bar, this receiver doesn’t have a display, so you’ll need a Bluetooth ready laptop or PDA with mapping software to make a complete navigation setup. But the eight-hour rechargeable battery and wireless connection lets you throw it on the dash without dangling wires. Uniquely, it can also operate as a stand-alone track logger, automatically storing thousands of position and speed data points for later wireless download. Use it to track the roving of everything from balloons to your cat. Supports the NMEA data exchange standard for easy interfacing.