The VideoRay ROV GPS can be used to "seed" the world position of the ROV. The GPS antenna / module is mounted on an retractable mast. The mast should be extended for operations and retracted for land transport and storage. It can be extended and retracted by pulling or pushing on the module. It has click-in stops at each end of travel. GPS does not work underwater, but as you will see, other sensors can be used to track the location of the vehicle once it submerges.