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HF Radiotelephone Channels
http://www.navcen.uscg.gov/marcomms/high_frequency/default.htm
Complete duplex and simplex channel plan available for download.
US Coast Guard NAVTEX
http://www.navcen.uscg.gov/marcomms/gmdss/navtex.htm
Information about worldwide NAVTEX coverage.
VHF Marine Radio Channels and Frequencies
http://www.navcen.uscg.gov/marcomms/vhf.htm
U.S. VHF Marine Radio Channels and Frequencies Commandant (G-SCT-2) U.S. Coast Guard