46 CFR §95.05-1

1. (a)Fire detection, manual alarm, and supervised patrol systems are not required except in special cases; but if installed, the systems must meet the applicable requirements of 46 CFR, part 76 of subchapter H (Passenger Vessels) of this chapter.
2. (b)In each compartment containing explosives, and in adjacent cargo compartments, there must be provided a smoke detection system. When used, sample extraction smoke detection systems must meet the requirements in § 95.05-3.
3. (c)Enclosed spaces that are “specially suitable for vehicles” must be fitted with a fire detection and alarm system.