50 CFR § 697.9
Facilitation of enforcement
July 17, 2020
(a) General. See §600.730 of this chapter.
(b) Radio hails. Permit holders, while underway, must be alert for communication conveying enforcement instructions and immediately answer via VHF-FM radio, channel 16, when hailed by an enforcement officer. Vessels not required to have VHF-FM radios by the Coast Guard are exempt from this requirement.
[64 FR 68248, Dec. 6, 1999, as amended at 73 FR 67809, Nov. 17, 2008]