33 CFR §67.10-1

1. (a)Have its maximum intensity at a frequency between 100 and 1,100 Hertz;
2. (b)Sound a 2-second blast every 20 seconds (2 seconds sound, 18 seconds silence) unless otherwise authorized by the District Commander;
3. (c)Have the rated range required by § 67.20-10, § 67.25-10, or § 67.30-10;
4. (d)Have a height not exceeding 25 feet;
5. (e)Have not more than eight sound sources;
6. (f)Be approved by the Coast Guard under § 67.10-15; and
7. (g)Be permanently marked with:
   1. (1)The date of Coast Guard approval;
   2. (2)The manufacturer and date of manufacture;
   3. (3)A model designation;
   4. (4)The approved range; and
   5. (5)The power necessary to comply with the provisions of paragraph (c) of this section.