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COLREGs

What does constant bearing with decreasing range suggest?

Short answer

Possible risk of collision

A steady approaching bearing is a strong Rule 7 warning, but it is not the whole assessment: use repeated observations and all appropriate means, and deem risk to exist if doubt remains. Revise Risk of Collision.

Sources and scope

Reviewed by Richard Moore on . This answer is scoped to united kingdom and general recreational seamanship; check the current chart, publication, local rules and official operational guidance before acting afloat.

Quick check

What does constant bearing with decreasing range suggest?