Marine Order 21, issue 8
52General emergency alarm signal
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52 General emergency alarm signal
52.1 The general emergency alarm signal for an emergency station muster of the passengers and crew of a ship is a signal of at least 7 short blasts followed by 1 long blast on the ship’s whistle or siren.
52.2 In an emergency, the master of a ship must ensure that:
(a) the general emergency alarm signal is sounded, and repeated on the ship’s electrically operated warning bell system; and
(b) suitable instructions to passengers and crew are given over a public address system, if fitted, or by any other means available.