Sec. 80.307  Compulsory use of radiotelegraph auto alarm.

    The radiotelegraph auto alarm required on a cargo ship subject to 
the radiotelegraph provisions of part II of title III of the 
Communications Act or the Safety Convention must be in operation, 
connected to the main antenna and adjusted for optimum efficiency at all 
times while the ship is being navigated in the open sea when a radio 
officer is not listening on the frequency 500 kHz, except under the 
circumstances as set forth in Sec. 80.306(b).