It is a rule - so never
It is a rule - so never
It is a rule - so never
It is a rule - so never
to avoid immediate danger
Any vessel over 7 meters is required to show Navigation lights between sunset to sunrise and in any times of restricted visibility. See Rule 20, Application. For a full list of Navigation Rules, see the link below.
When absolutely necessary to avoid a collision.
A whistle or Horn
To keep boats from running in to each other, hurting people and damaging boats.
Look for it on navigation
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