50 C.F.R. § 660.704 Vessel identification.
Title 50 - Wildlife and Fisheries
(a) Official number. Each fishing vessel subject to this subpart must display its official number on the port and starboard sides of the deckhouse or hull, and on an appropriate weather deck so as to be visible from enforcement vessels and aircraft. (b) Numerals. The official number must be affixed to each vessel subject to this subpart in block Arabic numerals at least 10 inches (25.40 cm) in height for vessels more than 25 ft (7.62 m) but equal to or less than 65 ft (19.81 m) in length; and 18 inches (45.72 cm)in height for vessels longer than 65 ft (19.81 m) in length. Markings must be legible and of a color that contrasts with the background.
Title 50: Wildlife and Fisheries
PART 660—FISHERIES OFF WEST COAST STATES
Subpart K—Highly Migratory Fisheries
§ 660.704 Vessel identification.