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32

Definitions (Sound Signals)

Defines short blast (about 1 second) and prolonged blast (4 to 6 seconds).

Rule 32 defines sound signal terms:

a
The word "whistle" means any sound signalling appliance capable of producing the prescribed blasts.
b
The term "short blast" means a blast of about one second's duration.
c
The term "prolonged blast" means a blast of from four to six seconds' duration.

Signal Workflow

1

Decide the context first: manoeuvring in sight, restricted visibility, or distress. The same whistle can mean very different things in a different context.

2

Check both the pattern and the interval. For fog signals, the time spacing is part of the rule, not just the blast sequence.

3

When in doubt about another vessel's intentions, use the prescribed warning signal early rather than waiting for the situation to deteriorate.

Exam Focus

1

Three short blasts are astern propulsion, not a fog signal.

2

In restricted visibility, think 'every two minutes' for underway signals and 'every one minute' for anchor bell signals.

Key Takeaways

1

Short blast = approximately 1 second

2

Prolonged blast = 4 to 6 seconds

3

Whistle means any prescribed sound signalling device

Common Mistakes

Making short blasts too long or prolonged blasts too short

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