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"Roger That," "Mayday" & More "Roger" stems from the days of Morse code communications when the letter "R" was used to indicate "received" or "message understood." As radio communications became more popular and the technology evolved, the U.S. military adopted the term "roger" for the same reason.

To terminate communications, simply conclude the transmission with the word "OUT" (which means "conversation is ended and no response is expected").

CHANNELS 68, 69, 71, 72, 78A: "Working Channels." The only channels available to non-commercial vessels for ship-to-ship and ship-to-shore communications. (Although you may have many other channels on your radio, each of them is restricted to specific uses.)

New Channel NumberOld Channel NumberUse102222ACoast Guard Liaison and Maritime Safety Information Broadcasts. Broadcasts announced on channel 16.6868Non-Commercial. VDSMS6969Non-Commercial. VDSMS7070Digital Selective Calling (voice communications not allowed)5 more rows

In the United States, the frequencies used for these systems may be grouped into four general bands or ranges: low-band VHF (49-108 MHz), high-band VHF (169-216 MHz), low-band UHF (450-806 MHz), and high-band UHF (900-952 MHz). VHF represents Very High Frequency while UHF represents Ultra High Frequency.

Out is used to signal the end of the conversation between users. So when responding to a request for information or compliance, a user would say Over at the end of their transmissions.

(military) a radio callsign modifier that specifies the commanding officer of the unit or asset denoted by the remainder of the callsign and not the officer's assistant or other designee. Bravo Six Actual, this is Charlie One. Come in, over.