How many fire extinguishers are required abroad an 18 foot power boat with installed fuel tanks?

The requirement for fire extinguishers on an 18-foot powerboat with installed fuel tanks typically follows the regulations set by the U.S. Coast Guard. Generally, at least one B-I type fire extinguisher is required for boats under 26 feet. However, it's essential to check local regulations and guidelines, as they can vary by region and country.