Which lettering size is specified for vessel markings?

• A. 2 inch letters
• B. 3 inch letters
• C. 1 inch letters
• D. 4 inch letters

Answer: (B)

Markings on a vessel must be sized for legibility at typical viewing distances on the water. Three-inch letters are the standard minimum height used to ensure hull markings, like the vessel name and port of registry, are readable in normal conditions. One- and two-inch letters are typically too small to read reliably from a distance or in glare and rough water, while four-inch letters are larger than standard minimums and unnecessary for most vessels. So, three-inch lettering provides the practical balance between visibility and fit on the hull.