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All questions
Blind areas

A blank wedge remains on the same relative bearing when the boat changes heading. Which cause should be investigated first?

Short answer

An onboard blind or shadow sector

Onboard structures can create vessel-fixed blind sectors. Cover them with other lookout evidence; never call them clear. Revisit Line of Sight and Shadow.

Quick check

A blank wedge remains on the same relative bearing when the boat changes heading. Which cause should be investigated first?