Code of Federal Regulations Title 47. Telecommunication § 47.80.393 Frequencies for AIS stations

Automatic Identification Systems (AIS) are a maritime broadcast service. The simplex channels at 156.775 MHz (AIS 3), 156.825 MHz (AIS 4), 161.975 MHz (AIS 1), and 162.025 MHz (AIS 2), each with a 25 kHz bandwidth, may be authorized only for AIS. In accordance with the Maritime Transportation Security Act, the United States Coast Guard regulates AIS carriage requirements for non–Federal Government ships. These requirements are codified at 33 CFR 164.46, 401.20.