🔍 Key Concepts

• Official Number marking requirements for U.S. vessels (46 CFR – vessel documentation and marking) • Where the Official Number must be placed on small passenger vessels (interior vs. exterior) • How the number must be physically attached and sized so tampering is detectable

💭 Think About

• Look at what the regulations require about location of the Official Number inside the vessel—does it have to be on a particular kind of part? • Consider what the rules say about the appearance of the numbers (style and minimum height). Do any options match that description exactly? • Think about why the Coast Guard cares about the number being hard to remove or alter. Which choices reflect an anti‑tampering requirement?

✅ Before You Answer

• Verify whether the Official Number must be on a clearly visible interior structural hull part • Check if the regulation specifies block type Arabic numerals not less than 3 inches high • Confirm if it must be permanently affixed so that any alteration, removal, or replacement would be obvious