You are in a situation where strict compliance with COLREGs Rule 15 (crossing — you are give-way) would require you to alter to starboard, but a large shoal lies to your starboard and there is no sea room for the manoeuvre. What does Rule 2(b) permit you to do?

A. Rule 2(b) — General Prudential Rule: "In construing and complying with these Rules, due regard shall be had to all dangers of navigation and collision and to any special circumstances, including the limitations of the vessels involved, which may make a departure from these Rules necessary to avoid immediate danger." Rule 2(b) permits — and indeed requires — a departure from a specific rule when strict compliance would itself create a danger. In this scenario: altering to starboard per Rule 15 would ground the vessel on the shoal — Rule 2(b) permits you to depart from Rule 15 and take the action necessary to avoid immediate danger (the shoal). Options: (a) reduce speed to let the crossing vessel pass ahead; (b) alter to port if sea room exists on that side; (c) stop or anchor if necessary. The action taken must still aim to avoid collision with the crossing vessel while also avoiding the shoal — Rule 2(b) is not a blanket escape from collision avoidance obligations.

B. Rule 2(b) does not apply when there is any navigable water on the alternative side. You must take the prescribed Rule 15 action regardless of the shoal and trust that the other vessel will give way if the manoeuvre creates a new hazard.

C. Rule 2(b) allows any vessel to ignore all COLREGs whenever there is a risk of grounding. The Master has unlimited discretion to depart from any rule when the vessel's safety is concerned.

D. In constrained water, the vessel restricted by the shoal automatically becomes a CBD vessel and has stand-on status under Rule 18(d). No alteration is required.

A. COLREGs Rule 6 (Safe Speed) and ISM Regulation 5 (Master's Overriding Authority) together create an absolute obligation: the Master must navigate at safe speed regardless of commercial pressure. A speed that allows the vessel to stop within half the visibility distance or less is the practical test in restricted visibility. At 0.5nm visibility with significant traffic risk, 6 knots or less is likely necessary. ISM Code Reg 5: "The Company shall establish in the SMS that the Master has the overriding authority and the responsibility to make decisions with respect to safety and pollution prevention and to request the Company's assistance as may be necessary." The charterer's laytime claim cannot override the Master's safety obligation. Action: reduce to safe speed; document the decision in the OLB with the meteorological conditions and COLREGs reasoning; inform the company in writing; request the company provide written confirmation if they want you to maintain speed (they will not do so as it would make them complicit). A collision caused by excessive speed in fog would expose the Master personally to criminal prosecution under the Merchant Shipping Act 1995.

B. Laytime runs regardless of weather. The Master has a contractual obligation to the charterer that overrides the discretionary safe speed provisions of Rule 6.

C. 16 knots is acceptable in 0.5nm visibility if radar is operational. Rule 6 permits any speed when the vessel has functioning radar and ARPA.

D. Reduce to 12 knots as a compromise — this satisfies both the charterer's commercial requirements and a reasonable safe speed interpretation.

A. Criminal liability exposure for the Master: (1) Merchant Shipping Act 1995 Section 58 — Conduct endangering ship or persons on board: "A master of, or seaman employed in, a United Kingdom ship who, while on board the ship, does any act which causes or is likely to cause the loss or destruction of or serious damage to his ship or the death of or serious injury to a person on board his ship is guilty of an offence." This applies where the Master failed in their supervisory duty; (2) MS Act 1995 Section 100 (manslaughter) and Gross Negligence Manslaughter (common law) — if injury leads to death, the Master may face manslaughter charges if their conduct was grossly negligent; (3) ISM duty: failure to ensure adequate bridge watchkeeping and OOW supervision; (4) The Master is also exposed to personal P&I subrogation claims if found personally negligent. The fact that the OOW was technically compliant with lane navigation but not with COLREGs Rule 8 timing raises questions about bridge supervision and watchkeeping instruction under the Master's standing orders.

B. Criminal liability rests solely with the OOW who was on watch. The Master is not on the bridge and bears no responsibility for the OOW's actions under COLREGs.

C. No criminal liability arises from a collision in a TSS if the vessel was in the correct lane. TSS lane compliance provides a complete defence to any COLREGs prosecution.

D. Criminal liability only applies if the collision was deliberate. Negligent navigation is a civil matter resolved through P&I insurance, not criminal proceedings.