(a) Each pumping platform complex must have a sound signal, approved under subpart 67.10 of this chapter, that has a 2-mile (3-kilometer) range. A list of Coast Guard-approved sound signals is available from any District Commander.

(b) Each sound signal must be:

(1) Located at least 10 feet, but not more than 150 feet, above mean high water; and

(2) Located where the structure of the platform, or equipment mounted on it, does not obstruct the sound of the signal in any direction.