You are planning to cross the Dover Strait TSS in a yacht at 6 knots. The lane is 8nm wide and traffic density is high. What is your crossing strategy?

A. Reduce speed and wait in the lane until traffic clears — maintaining position is safest

B. Cross at the fastest convenient angle regardless of Rule 10

C. Cross at 90° to the traffic flow (COLREGs Rule 10) at the narrowest safe point; time the crossing to minimise exposure; identify gaps in traffic on radar/AIS; use the engine to maintain maximum speed through the lane; brief the crew on traffic ahead of time

D. Use the Separation Zone as a safe crossing corridor — it is designated for smaller vessels

A. The passage plan need only identify the destination — diversion decisions are made in real time

B. A port of refuge provides a safe haven if conditions deteriorate. Suitability factors: accessible in the expected conditions (depth, bar, height of tide); distance from passage track; available facilities (fuel, medical, communications); whether it can be entered at night; holding ground if anchoring is the only option

C. Any port on the chart is automatically suitable as a refuge regardless of conditions

D. Ports of refuge only matter for vessels without an engine — sailing yachts can always divert

A. A tidal gate is another term for a tidal stream atlas symbol on the chart

B. Tidal gates only apply to vessels over 20 metres in length

C. A point on the passage (headland, strait, harbour bar) that can only be safely transited within a specific tidal window — the departure time and speed must be calculated backwards from the tidal gate time to ensure arrival within the window

D. A lock gate at a tidal harbour — only relevant to inland waterways