86.03—Limits of fundamental frequencies.
To ensure a wide variety of whistle characteristics, the fundamental frequency of a whistle shall be between the following limits:
(a)
70-200 Hz, for a vessel 200 meters or more in length;
(b)
130-350 Hz, for a vessel 75 meters but less than 200 meters in length;
(c)
250-525 Hz, for a vessel less than 75 meters in length.