Your vessel has been in restricted visibility for 18 hours. The master (you) and the chief mate have been on the bridge continuously. Rest hours are now violated. What do you do?

A. PROLONGED FOG — CREW FATIGUE MANAGEMENT: SITUATION ASSESSMENT: 18 hours on bridge for master and chief mate — well below STCW minimum 10 hours rest in 24. Both are now significantly fatigued. FATIGUE IS A SAFETY HAZARD — decision-making, vigilance, and reaction time are all significantly impaired. OPTIONS: (1) ANCHOR: if a suitable anchorage is available — anchor the vessel. This removes the active navigation hazard, allows the bridge team to properly rest, and resumes passage when rested. Most practical solution; (2) PORT OF REFUGE: if the vessel is near a port, seek a berth to allow proper rest before continuing; (3) MANAGE THE WATCH WITH THIRD OFFICER: if a qualified third officer can maintain an OOW watch — implement a proper watch rotation. Master rests 4-6 hours with standing instruction to call if any target closes to within 2nm CPA or visibility drops further. Risk: master and C/M unavailable if an emergency develops; (4) COMMUNICATE WITH COMPANY: notify DPA that prolonged fog has caused rest hour violations — this is an ISM non-conformity that must be documented and reported. The company must support the master's decision to anchor or seek refuge; (5) STCW REST HOURS: exceptions exist for genuine emergency/operational necessity — but 18 hours in fog is approaching the limit of what can be called "exceptional." Continued operations without proper rest are a systemic risk; (6) DO NOT IGNORE FATIGUE: a fatigue-impaired master is more likely to make an error that causes a collision than a rested third officer standing a careful watch.

B. Continue the watch — experienced masters can function effectively for 24+ hours without rest. The bridge team's experience compensates for fatigue.

C. Give the third officer the watch and go below for 8 hours without specifying any calling criteria. The third officer takes full responsibility during that time.

D. Take stimulants (coffee, energy drinks, or medication) to maintain alertness. Medical evidence shows caffeine fully compensates for 18 hours of wakefulness.

A. COMMAND DECISION — 100M VISIBILITY: 100m visibility is extreme — visibility less than the vessel's own length. THE CORRECT DECISION: this vessel should NOT proceed into the Dover Strait TSS in 100m visibility. REASONING: (1) RULE 6 SAFE SPEED: a 200m tanker in ballast at any speed above absolute minimum cannot stop within 100m. Even at 3 knots, the stopping distance far exceeds visibility. No manoeuvrable speed satisfies the Rule 6 safe speed test; (2) TSS TRAFFIC: Dover Strait carries ~500 vessel transits per day. Other vessels of all sizes are in the TSS. At 100m visibility, you have zero warning of oncoming traffic until they are within 100m — effectively no warning; (3) MASTER'S AUTHORITY: under SOLAS V/34-1, the master's authority to make decisions for safety of the vessel is absolute. Commercial considerations CANNOT override this; (4) LEGAL EXPOSURE: proceeding in 100m visibility with no ability to comply with Rule 19 (safe speed, effective avoiding action) and causing a collision will result in criminal prosecution, civil liability, and potential imprisonment for the master; (5) CORRECT ACTION: wait. Heave-to outside the TSS or anchor in the Downs anchorage. Advise owners and charterers. The delay is finite — UK fog events typically last hours, not days; (6) ISM CODE: the ISM Code Section 5 gives the master overriding authority on safety matters. The company CANNOT instruct the master to proceed unsafely. Any such instruction must be refused and documented.

B. Proceed at 3 knots — this is safe speed in 100m visibility. ARPA will detect vessels in time at this slow speed and you can take avoiding action.

C. Increase speed to transit the Dover Strait as quickly as possible. Less time in restricted visibility equals less total risk.

D. Contact Dover VTS and ask them to clear the traffic lane before you transit. VTS has authority to hold other traffic while you pass.

A. FOG COLLISION LEGAL CONSEQUENCES — MASTER: (1) IMMEDIATE: render assistance to survivors (SOLAS V/33 — duty to assist); call MRCC for SAR; sound MAYDAY; recover survivors; (2) PRESERVE EVIDENCE: do not erase VDR. Preserve deck logs, ARPA recordings, bridge audio, AIS data, weather records, watch logs. Contact company DPA and P&I Club immediately; (3) COASTAL STATE: UK coastguard will direct the tanker to port for inspection. Do NOT depart the area without coastguard permission; (4) MCA INVESTIGATION: Marine Casualty Investigation under the Merchant Shipping (Marine Accident Investigation) Regulations 2012. MCA inspector will attend and seize records; (5) MAIB: the Marine Accident Investigation Branch (MAIB) will conduct an independent investigation under the Merchant Shipping (Accident Reporting and Investigation) Regulations 2012. MAIB is NOT a prosecutorial body but its reports are used as evidence; (6) CRIMINAL LIABILITY — MASTER: if the collision was caused by grossly negligent navigation (excessive speed in fog is classic), the master faces: (a) Gross negligence manslaughter (common law) — up to life imprisonment; (b) Health and Safety at Work Act offences; (c) COLREG violations (Merchant Shipping Act 1995 S98); (7) CIVIL LIABILITY: shipowner's P&I Club handles the civil claim from the fishing vessel owner and the deceased's family; (8) CoC SUSPENSION: MCA may suspend the master's certificate pending investigation; (9) FORMAL INQUIRY: if the circumstances warrant, a Formal Investigation (akin to a public inquiry) may be ordered under the Merchant Shipping Act 1995.

B. The company's P&I insurance covers all consequences. The master only needs to file an incident report with the company and no further personal legal exposure exists.

C. Collisions at sea are governed exclusively by COLREG — the master will be assessed under COLREG Rule 19 and no criminal proceedings can arise from a maritime collision.

D. Contact the company's lawyers before making any statements. The master should not communicate with the coastguard, MAIB, or MCA until legal representation is in place.