Section 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.USCG-1998-3884, 71 FR 57651, Sept. 29, 2006, as amended by USCG-2013-0397, 78 FR 39179, July 1, 2013