Final answer:
Inboard motorboats without an approved fixed system are required to carry varying numbers of B-1 or B-2 type fire extinguishers, depending on the vessel's length, to ensure safety onboard in case of a fire.
Step-by-step explanation:
The carriage requirements for a fire extinguisher on an inboard motorboat not equipped with an approved fixed system vary depending on the size of the vessel and the regulations set by maritime authorities such as the United States Coast Guard (USCG). In general, boats under 26 feet require at least one B-1 type fire extinguisher. Boats 26 to 40 feet need at least two B-1 fire extinguishers or one B-2 type. While boats 40 to 65 feet need a minimum of three B-1 extinguishers or one B-2 and one B-1 extinguisher. It is critical for safety to have these portable fire extinguishers readily accessible and in working order in case of a fire onboard.