The Cerulean GPS is rated to 300 meter depth and is designed to have a low non-snag profile and to ward off accidental blows.
Our module is built around a MTK3339 chipset able to track up to 22 satellites on 66 channels. It has an outstanding high-sensitivity receiver (-165 dB tracking), and a built-in antenna. The unit is able to perform 10 location updates a second for high speed, high sensitivity logging, or tracking. Power usage is astonishingly low, only 20mA during navigation.