Tuesday, April 1, 2025

USCG is changing radio channel ID numbers

US Coast Guard (USCG) channel numbers are currently transitioning. Per
the USCG: "In accordance with the ITU (International
Telecommunications Union), the Coast Guard will start utilizing
four-digit channel number designators in communications with the
public. As an example, instead of shifting mariners to channel 22A, we
will be shifting them to channel 1022."

from the jan 2025 MACS 441-1 document

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