google gps tracker logger - there are tons of devices.

here's one with 120 hrs of motion memory (activates automatically when in motion)

http://www.bhphotovideo.com/bnh/controller/home?O=&sku=937042&gclid=CLGJ0ebj4MUCFQqGaQodEGcAkw&Q=&is=REG&A=details