You receive a MAYDAY from a vessel 30nm to your north. You are the closest vessel. MRCC asks you to proceed at best speed and assume OSC duties. Two other vessels are also responding. It is dark with 5m swell. How do you manage the operation?

A. MASTER AS OSC — SAR coordination: (1) ACKNOWLEDGE RCC: confirm assumption of OSC role to MRCC Falmouth; (2) BEST SPEED: apply maximum power — ETA to scene approximately 2 hours at 15 knots; advise MRCC of ETA; (3) ASSISTING VESSELS: contact both other responding vessels on Ch 16; assign them areas/sectors for the search on arrival; confirm their ETAs and capabilities; (4) DISTRESS VESSEL CONTACT: attempt to raise the distressed vessel on VHF Ch 16 and Ch 70 DSC; obtain: last known position, nature of distress, number of persons, whether they are abandoning; (5) COMMUNICATIONS LOG: maintain a log of all communications — times, positions, information received; IAMSAR Vol III provides the format; (6) ON ARRIVAL: visual search using searchlights; radar sweep for target; request distress vessel to fire parachute rocket if they have communications; (7) RESCUE: recover survivors using rescue boat (if sea state permits) or position the vessel downwind and let survivors drift to you; (8) SITREP TO MRCC: every 15 minutes — persons found, condition, actions taken; (9) TRANSFER OF COMMAND: if a dedicated SAR vessel (Coastguard SAR) arrives — transfer OSC to them formally on VHF; (10) POST-RESCUE: survivors — medical assessment; official log entry; names for MRCC; onward transportation arrangements.

B. In 5m swell and darkness, a rescue attempt is too dangerous. Hold position 5nm away and advise MRCC you are on scene but cannot safely approach until daylight.

C. Transmit a MAYDAY relay for the distressed vessel and leave the SAR to the coast guard. Commercial vessels are not obligated to perform SAR operations.

D. Dispatch your rescue boat immediately on arrival — 5m swell conditions are within the design parameters of a SOLAS rescue boat.

A. ABANDON SHIP DECISION — command analysis: (1) FACTORS FOR IMMEDIATE ABANDON: fire has breached CO2 total flooding — the fixed system has failed; structural integrity now at risk; uncontrolled fire progression; water temperature 6°C limits survival time to approximately 30-60 minutes — the sooner into the water, the more daylight/SAR time available; (2) FACTORS AGAINST IMMEDIATE ABANDON: night-time, North Atlantic, Force 7-8 conditions — launching lifeboats in these conditions is extremely hazardous and may itself cause casualties; is there a safe refuge (citadel/fire boundary not yet breached); is a SAR helicopter or vessel ETA within 30-60 minutes (survival time in 6°C water); (3) DECISION FRAMEWORK: the master makes this call balancing the risk of remaining (growing fire) against the risk of abandonment (cold water, sea conditions). International guideline (IAMSAR/IMO Resolution): abandon ship when the vessel can no longer be considered a safe platform. In this scenario — uncontrolled fire with CO2 failure and structural risk = abandon; (4) TIMING: ensure EPIRB is activated, MAYDAY is sent, lifeboat/raft is ready BEFORE giving the order — do not order abandon before the means of abandonment are ready; (5) POSTMASTER'S AUTHORITY: no one else can give the order to abandon ship; the master does not wait for the company's permission — ISM Ch 5.2 expressly states the master's overriding authority on safety.

B. Never abandon ship at night in Force 7 conditions. Wait until daylight and improved conditions before giving the abandon ship order regardless of the fire severity.

C. Call the company for authorisation before abandoning ship. The ISM Code requires management approval for the decision to abandon.

D. The Chief Officer makes the abandon ship decision — the master should remain on the bridge to coordinate communications with the coast guard until the last moment.

A. COMMERCIAL PRESSURE vs SAFETY — Master's authority: (1) GM ASSESSMENT: 0.25m GM with containers and a Force 9 forecast must be assessed against the IS Code minimum (0.15m) AND the practical performance of the vessel in Force 9 (7-10m seas). While 0.25m exceeds the IS Code minimum, it provides very limited stability reserve in severe conditions with heavy rolling. A stability improvement should be sought — low ballasting, removal of topweight — before departure; (2) MASTER'S AUTHORITY: SOLAS V Rule 34.3 — the master's judgement on safety shall not be overridden by the owner, charterer, or any other person. ISM Code Ch 5.2 — overriding authority explicitly confirmed; (3) LEGAL POSITION: if the master departs under commercial pressure with an inadequate GM and the vessel capsizes, the master faces criminal negligence charges (MSA 1995 s.58 — operating in an unsafe manner). "I was told to go" is not a defence; (4) COMMUNICATION: document all communications — email/telex the charterer stating the reasons for delay and the decision. This creates an evidence trail; notify the company and DPA of the commercial pressure and safety concern; (5) STCW VIII/2: the master has the right to make decisions for the safety of the vessel and crew without interference; (6) DECISION: do not depart. Improve stability first. Reassess the departure weather window.

B. Depart as demanded. The charterer bears responsibility for any voyage where they demand departure — the master is indemnified by complying with charterer instructions.

C. Compromise: depart with the current stability but reduce speed to 5 knots. This reduces rolling and compensates for the low GM.

D. SOLAS stability criteria apply only to the departure condition. Once at sea, weather conditions may change and reduce the risk — the departure decision is solely commercial.