Definition
The point on an approach beyond which the vessel can no longer turn back or stop safely, so the decision to continue must be taken before reaching it. It is derived from turning circle, stopping distance, channel width and available depth, and is marked by an unambiguous trigger such as a bearing, a range or a transit. If the entry criteria, for example a visual reference, a working engine or a berth confirmation, are unmet, the vessel turns away.
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