![]() ![]() The Table below defines the channel numbering for maritime VHF communications based on 25 kHz channel spacing and use of several duplex channels. compared to most other maritime countries. The large number of blue channels and frequencies indicates the shortage of VHF maritime spectrum in the U.S. and are only available from the auction winner. ![]() Frequencies and channels shown in green were auctioned in the U.S. Note that a marine radio operating in the international mode on a channel in which the ship station frequency is shown in black and the shore station frequency shown in blue would not be able to communicate with a U.S. territorial waters, but are allowed on the high seas and in most other countries. Transmission on frequencies or channels shown in blue are not allowed within U.S. ![]() The following table is adapted from the International Telecommunications Union Radio Regulations Appendix 18, including changes adopted by the 2015 World Radio Conference. ![]()
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