USA licensing requirements
FCC station license requirement
LicensingUSA Requirement
An FCC Ship Radio Station License and Call Sign are not required for most recreational vessels travelling in US waters. However, you must obtain a license if your vessel travels to foreign ports.
Ships that use MF/HF single side-band radio, satellite communications, or telegraphy must be licensed by the FCC.
For more information, refer to the FCC website (Licensing tab): https://www.fcc.gov/bureau-divisions/mobility-division/ship-radio-stations#block-menu-block-4