What is US Mode?

In USA a number of ITU International Duplex Channels are converted and used as Simplex channels i.e., both ship and shore transmit on the ship’s frequency. (e.g., Ch 01, 05, 07, 18, 19, 21, 22, 23, 63, 65, 66, 78, 79, 80, 81, 82, 88)

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