Adafruit Ultimate GPS Breakout v3
Serial GPS module with onboard memory for continuous recording
This GPS module is made by Adafruit and runs on 3V3. Their description can be found at: http://www.adafruit.com/products/746.
Pinout is obvious from the picture above. Give it 3V3 at Vin, GND it, and sniff the output from Tx. The module can be set up for continuous recording with the mbed off. To do that, send it the command string via Rx. (Details for that LOCUS mode can be found at the Adafruit Learning System and their Arduinio library: http://learn.adafruit.com/adafruit-ultimate-gps/built-in-logging).