Question 1

Your vessel collides with another vessel in a TSS. Two crew members on the other vessel are injured. Investigations show your OOW was on the correct side of the TSS but failed to take avoiding action in time. As Master, what is your criminal liability exposure?

Accepted Answer

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. Masters are regularly prosecuted following collisions — this is not theoretical. The MS Act 1995 creates specific criminal offences for masters and seafarers. Section 58 covers "conduct endangering" — it does not require injury; the potential to cause injury is sufficient. For serious injuries or deaths, the Crown Prosecution Service (CPS) will consider gross negligence manslaughter charges. The Master's supervisory responsibility: even when not on the bridge, the Master is responsible for ensuring the watchkeeping system is fit for purpose — standing orders must specify safe speed, calling the master procedures, and COLREGs compliance requirements. If standing orders were inadequate and the OOW failed to follow safe practices, the Master bears some responsibility. Case law: Captains of numerous vessels have been prosecuted under MS Act provisions following collisions in UK waters — including the incidents in the Thames Estuary and Solent area. The MAIB investigation report following a collision will normally address criminal liability questions separately from the safety investigation.

Question 2

Your charterer is demanding you maintain 16 knots to arrive on schedule. Visibility has dropped to 0.5nm in fog. Your safe speed assessment suggests 6 knots maximum in these conditions. The charterer threatens to claim laytime damages. What is your position under COLREGs and ISM?

Accepted Answer

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. Commercial pressure versus safety is the paradigm Master-level examination question. The legal position is unambiguous: COLREGs are statutory regulations, not guidelines. Rule 6 imposes a legal duty on the Master — it is not a discretionary standard. A breach of Rule 6 that results in a collision constitutes a criminal offence under the Merchant Shipping Act 1995 Section 58 (misconduct endangering ship or persons on board) and potentially Section 131 (oil pollution). The Master is personally exposed — not just the company. Laytime and commercial damages: a time charterer's laytime claim arising from weather-related slow steaming is a commercial dispute handled through the P&I Club and the voyage charter provisions. A successful laytime claim costs money; a conviction for causing a collision through excessive speed costs the Master their certificate and potentially their freedom. The ISM system specifically creates the "overriding authority" provision to give Masters a clear documented basis for resisting commercial pressure — the OLB entry and company communication create a contemporaneous record.

Question 3

At night you observe: a green light and a red light close together, very low on the water, with a white light some distance astern also very low. The structure appears long and dark. What is this vessel and what special considerations apply?

Accepted Answer

SUBMARINE RUNNING ON THE SURFACE. Submarines are power-driven vessels when on the surface and display standard navigation lights (Rule 23): sidelights (red and green) and a sternlight (white). However: (1) The lights are very low to the water — the submarine's bridge fin (conning tower/sail) carries the lights, which are much lower than a surface ship's bridge wings; (2) The submarine is difficult to see visually against the sea surface — it is a low-profile vessel; (3) Submarines often have a speed in excess of their apparent visual size suggests — do not underestimate their speed; (4) Contact the submarine on VHF Ch 16 if concerned — NATO submarines monitor Ch 16; (5) Submerging submarines do not display any specific signal before diving — do not assume a submarine you have identified will remain on the surface; (6) Give a wide berth; (7) The sternlight low on the water with a gap between it and the sidelights indicates the length of the submarine. COLREGs treat submarines as power-driven vessels on the surface. Submarine identification at Master level is specific to command-level competency because the encounter requires not just COLREGs knowledge but operational awareness of military vessels. COLREGs application: submarines on the surface are bound by COLREGs in the same way as any power-driven vessel. They are NOT exempt as RAM vessels when surfaced (though submarines in certain operations may claim RAM or NUC status). The practical hazards: (a) submarines have very low freeboard — in any sea state they can be very difficult to detect visually; (b) their wake may be confused with that of a surface vessel at night; (c) they may be moving faster than expected (nuclear submarines can surface at high speed); (d) a submarine about to dive will give no visible warning — the OOW who has identified a submarine should not be surprised if it disappears from radar. Naval vessels generally: warships conducting exercises may claim RAM status and display appropriate lights/shapes. In practice, naval vessels on exercises in UK waters announce their activities on NAVTEX and in NOTAM broadcasts — the passage plan should check for active exercise areas.