47 CFR 80.80: Operating controls for ship stations.

(a) Each control point must be capable of:

(1) Starting and discontinuing operation of the station;

(2) Changing frequencies within the same sub-band;

(3) [Reserved]

(4) In the case of stations operating in the 156-162 MHz bands, reducing power output to one watt or less in accordance with § 80.215(e). 1

(b)-(f) [Reserved]

(g)(1) Any telegraphy transmitter constructed since January 1, 1952, that operates in the band 405-525 kHz with an output power in excess of 250 watts must be capable of reducing the output power to 150 watts or less.

(2) The requirement of paragraph (g)(1) of this section does not apply when there is available in the same station a transmitter capable of operation on the international calling frequency 500 kHz and at least one working frequency within the band 405-525 kHz, capable of being energized by a source of power other than an emergency power source and not capable of an output in excess of 100 watts when operated on such frequencies.