however , even here be has a large degree of security by way of revolving cameras that send images and sound back to his guards at the marina , where there is the standard helicopter prepared for immediate emergency takeoff ( here , unobserved conclusions may be drawn : there is a radar instrument that transmits river-map coordinates , and , as with his mercedes , gas jets on the gunwales designed to deter or kill unwanted boarders , the man at the helm protected by a simple mask , which was observed . )