Section 185.410 - Watchmen(a) The owner, charterer, master, or managing operator of a vessel carrying overnight passengers shall have a suitable number of watchmen patrol throughout the vessel during the nighttime, whether or not the vessel is underway, to guard against, and give alarm in case of, a fire, man overboard, or other dangerous situation.(b) Vessels described by 46 CFR 175.110(d) must submit plans to the cognizant OCMI, in accordance with 46 CFR 176.700 , for the installation and use of monitoring device to ensure the wakefulness of the watchmen required in paragraph (a) of this section. Vessels with a keel laid date after March 28, 2022, must include plans for the monitoring device(s) within the plan submissions required in 46 CFR 177.202 . The Coast Guard will work with the vessel operators to determine a reasonable implementation schedule once the plans are accepted. The monitoring device(s) must: (1) Ensure the wakefulness of the crew in the event that the watchman required in paragraph (a) of this section is unresponsive;(2) Remain operable during the nighttime watch; and(3) Be arranged to ensure proper coverage of the passenger accommodation spaces, common areas, and spaces with potential fire hazards.CGD 85-080, 61 FR 1005, Jan. 10, 1996, as amended at 62 FR 51359, Sept. 30, 1997; USCG-2021-0306, 86 FR 73172 , Dec. 27, 2021