Advanced Scenario Check: Backing Wind and Closing Escape

A fictional 11-metre yacht is anchored overnight in a crowded bay. The anchor was set and independently checked in settled conditions. At 0200 the wind backs and gusts across the entrance as the stream turns. The yacht now yaws towards a lee-shore hazard and a neighbouring vessel swings on a different arc.

The watchkeeper compares a shore transit, depth and two electronic ground positions. After allowing for the expected swing, those observations place the yacht 0.10 nautical mile closer to danger after six minutes. The remaining charted distance to the chosen danger boundary is 0.35 nautical mile. The original alarm radius is too broad to protect that new margin.

Convert six minutes to 0.1 hour. The observed closing rate is 0.10 nautical mile divided by 0.1 hour, which is 1.0 knot. At an unchanged 1.0 knot, 0.35 nautical mile would be covered in 0.35 hour, or 21 minutes. Recalculate independently: 21 minutes at 1.0 knot is 21 divided by 60, or 0.35 nautical mile.

Twenty-one minutes is not a safe waiting allowance. The rate can change, the danger boundary is not a collision prediction, and crew must be mustered before the yacht can be controlled and the cable recovered or released. The calculation is an urgency check that rules out delay; it is not an ETA to use up.

Give the first command as a coordinated sequence: alert and muster the required crew, ready or start propulsion when safe, establish helm and navigation control, keep people clear of the loaded cable and windlass, confirm cable and propeller separation, and execute the briefed departure, controlled re-anchor or assistance plan. If safe recovery cannot be achieved inside the remaining margin, preserve the vessel and people through the planned release or abandonment method rather than forcing the gear.

Continue navigating after the anchor no longer provides control. Maintain a proper lookout, display or sound the signals required by the vessel's actual status, communicate early when assistance is needed and do not let the foredeck task obscure the lee shore, traffic or escape route. The exact engine, helm, cable and distress actions remain vessel- and situation-specific.