In addition to obstruction lights, the tallest platform of a deepwater port must have a lit rotating beacon that distinguishes the deepwater port from other surrounding offshore structures. The beacon must:

1. (a) Have an effective intensity of at least 15,000 candela;
2. (b) Flash at least once every 20 seconds;
3. (c) Provide a white light signal;
4. (d) Operate in wind speeds of up to 100 knots at a rotation rate that is within 6 percent of the operating speed displayed on the beacon;
5. (e) Have one or more leveling indicators permanently attached to the light, each with an accuracy of ±0.25 ° or better; and

6. (f) Be located:

   1. (1) At least 60 feet (about 18.3 meters) above mean high water;
   2. (2) Where the structure of the platform, or equipment mounted on the platform, does not obstruct the light in any direction; and
   3. (3) So that it is visible all around the horizon.