Which channel carries the aloft warnings?

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Aloft warnings are meant to be heard by everyone on the ship, including personnel working high up on masts or rigging. The main channel used for broadcasting to the entire crew is the ship’s 1MC, the general audible signaling system. It is designed to deliver broad shipwide announcements and alarms quickly, so warnings about conditions aloft reach all hands everywhere on the vessel. The radio is for point-to-point or limited-group communications, not a guaranteed shipwide alert; the deck log is simply a record of events, not a communication channel; and while the Public Address System can handle announcements, the authoritative, shipwide channel for aloft warnings is the 1MC.