PART D: Sound & Light Signals

Snapshot

Rules 32 to 37

This part outlines the rules for the sounds used when signalling manoeuvres and during restricted visibility (fog signals).

Bells, gongs, whistles and lights make up the various combinations of signals available. However, most of the time, the only signal we’ll use or hear is a whistle. Unfortunately, the term whistle is a little misleading, as it refers to any sound signalling appliance, usually a horn. Bells and gongs are reserved for longer vessels to indicate their length when anchored in restricted visibility.

Signals are broken into three categories:

Manoeuvring & warning

These signals are focused on communication. They allow vessels to communicate their intentions, ask a question of another vessel, or reply to confirm their understanding of the situation.

Restricted visibility

The sound signals used in restricted visibility replace what would otherwise be visible by day, using shapes, or night using lights. The rule book’s definitions and application fundamentally change in restricted visibility

Attracting attention & distress

Lastly, are signals used to attract attention or indicate distress. The distress signals are found in annex IV of the rules, which includes the Mayday message, VHF DSC, and EPRIB, among some of the more old-fashioned methods.

If you belive the Earth is flat, you're about to fall of the end...

If you belive the Earth is flat, you're about to fall of the end...