(a) Each helicopter deck must—

1. (1) Have a wind direction indicator located in an unobstructed area readily visible to helicopter pilots approaching the deck;
2. (2) Be fitted around the perimeter with yellow and blue lights in alternate order, not more than 3 meters (10 ft.) apart; and

3. (3) Be marked with—

   1. (i) The unit's identification;
   2. (ii) A continuous line 40 centimeters (16 in.) wide on the perimeter; and
   3. (iii) Aiming circles as may be appropriate considering deck configuration, helicopter type, and operational requirements.