33 CFR 149.570: How is a platform, single point mooring, or submerged turret loading identified?

(a) Each platform, single point mooring, or submerged turret loading (STL) that protrudes above the water or is marked by a buoy must display the name of the deepwater port and the name or number identifying the structure, so that the information is visible:

(1) From the water at all angles of approach to the structure; and

(2) From aircraft on approach to the structure if the structure is equipped with a helicopter pad.

(b) The information required in paragraph (a) of this section must be displayed in numbers and letters that are:

(1) At least 12 inches high;

(2) In vertical block style; and

(3) Displayed against a contrasting background.

(c) If an STL protrudes from the water, it must be properly illuminated in accordance with § 149.540 of this part.