StacksVerified U.S. regulatory reference

33 CFR §67.20-10

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)The owner of a Class “A” structure shall:
    1. (1)Install a sound signal that has a rated range of at least 2 miles; and,
    2. (2)Operate the sound signal when the visibility in any direction is less than 5 miles.
  2. (b)The District Commander may waive any requirements in paragraph (a) of this section if he or she finds that a structure is so close to other structures and so enveloped by the sound signals on other structures that it is not a hazard to navigation.