How many fire exstiguishers is required for a 18 foot powerboat withinstalled fuel tanks?

For an 18-foot powerboat with installed fuel tanks, at least one fire extinguisher is required. However, it is recommended to have two extinguishers for added safety, especially if the boat is used for activities that increase the risk of fire. The extinguishers should be U.S. Coast Guard-approved and suitable for marine use. Always check local regulations, as requirements may vary.