Rule 22

The ranges of lights can be a guide to the distance off of a given vessel.

For example, if a large ship is sighted and the masthead lights can be seen, but not the sidelights, the ship may be between 3 and 6 miles away.

This technique is going to a very approximate approach, and whilst useful should be treated with caution.

Go to test on Rule 22.

Go to Rule 23.







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