United States Coast Guard
From The RadioReference Wiki
The USCG are heavy users of the Marine VHF band; Channel 16 is reserved for distress, safety and calling, while channel 22A is utilized for special warnings, Marine Safety and other announcements. Other frequencies utilized vary from sector to sector.
Air Operations
New nationwide United States Coast Guard frequencies, as of January 1, 2005, are listed below. The frequencies were changed due to the mandate to vacate 380-400 MHz so that the spectrum could be used for military trunked radio systems.
345.0 Operations Primary AM Mode 237.9 Operations Secondary AM Mode 326.15 Air-to-Ground Primary AM Mode 379.05 Air-to-Ground Secondary AM Mode
HF Operations
5696 USB Primary Night Operations 8983 USB Daytime Operations 11202 USB Daytime Operations
In addition, the USCG now uses the COTHEN ALE Network for communications