Module 17 - Marine Environment

Advanced Scenario Check: Environment

You are approaching an English protected bay before dusk. The current site notice marks a voluntary no-anchor zone over the seagrass. The authorised advanced moorings are occupied, two wildlife-watching craft are already close to a group of dolphins and the harbour beyond has just reported that its pump-out is unavailable. The holding tank has reached its planned reserve. Freshening onshore wind will make the bay less comfortable after dark.

The old plan has lost several independent assumptions: no verified mooring remains, the tank facility is unavailable, wildlife pressure is already high and the weather margin is reducing. None alone justifies an unsafe manoeuvre; together they make delay costly. Maintain safe vessel control, remain predictable and clear of the wildlife, preserve tank capacity and assess the pre-checked berth or harbour alternative before darkness and onshore wind narrow the choice.

Do not take an unverified private buoy, anchor inside the known seagrass measure, approach the dolphins to wait, or consume the tank reserve while hoping the facility reopens. State who takes the helm, who checks the latest notice and alternative, who controls heads use and who updates the log and crew. If the alternative is no longer safely reachable, reassess refuge and assistance from the actual remaining conditions rather than forcing the original plan.

This lesson can rehearse evidence, gates and command language. It cannot verify a live protected-area boundary, decide the law for an unidentified jurisdiction or demonstrate practical Yachtmaster command. The skipper must use current official and local information and preserve the safety of vessel and crew.

Tempting shortcutWhy it failsDefensible response
Pick an unverified buoyPresence does not prove authority, capacity or conditionUse a verified stopping option
Anchor in the voluntary zoneKnown habitat impact remains relevant without a displayed fineRespect the current measure and verify a clear alternative
Wait beside the dolphinsMore craft can compound disturbanceKeep clear and remain predictable
Use the tank reserveThe reserve is a decision trigger, not free capacityReduce use and divert while options remain

Optional quick check

Section 10 of 10

With the authorised moorings occupied and the holding tank at reserve, which response is strongest?

Choose one answer
Sources and factual review

Reviewed 20 August 2026 - Compass Revision editorial review.

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This public lesson is part of Revision Module 17. Full revision access adds the guided Learn, Practise and Test flow, flashcards and revision progress.