Question 1

Your chief officer presents a completed passage plan for a transatlantic voyage. As Master, describe your approval process and your legal obligations under SOLAS V/34.

Accepted Answer

PASSAGE PLAN APPROVAL — MASTER'S SOLAS V/34 OBLIGATIONS: SOLAS V/34 LEGAL REQUIREMENT: "Prior to proceeding to sea, the master shall ensure that the intended voyage has been planned using an appropriate chart and appropriate nautical publications for the area concerned, taking into account the guidelines and recommendations developed by the IMO." This is an absolute obligation on THE MASTER — not the chief officer. The master cannot delegate this legal responsibility. WHAT THE MASTER MUST VERIFY IN THE PASSAGE PLAN: (1) APPRAISAL: is the passage planned using the correct, up-to-date charts (latest edition, NTM corrections applied)? Have the relevant nautical publications been consulted (Sailing Directions, Light Lists, Tide Tables, NtM, Notices to Mariners)? Have weather routing service recommendations been considered?; (2) PLANNING: is the passage plan complete from berth to berth? Does it include: (a) waypoints with safe clearing bearings or distances; (b) no-go areas clearly marked; (c) abort points — where is the last point at which the vessel can safely alter to an alternative port?; (d) wheel-over positions for planned alterations?; (e) UKC calculations at minimum water depth points?; (f) speed calculations to ensure arrival at pilot station at the correct tidal window?; (3) EXECUTION CHECKS: are monitoring intervals appropriate to the waters transited? Are danger waypoint checks included?; (4) CONTINGENCY: is there a documented contingency plan for engine failure, medical emergency, severe weather forcing diversion?; (5) MASTER'S SIGN-OFF: the master must sign the passage plan, confirming approval. This signature carries legal weight. SOLAS V/34 — master-specific obligation: the explicit requirement is on "the master" — not "the ship" or "the officer." This is personal legal responsibility. The master who signs a passage plan as approved, having not reviewed it, shares liability with the preparing officer if the plan is found deficient after a casualty. MCA prosecutions and MAIB reports have repeatedly identified inadequate passage planning as a contributing cause of casualties. "Berth to berth" planning: IMO Resolution A.893(21) (Voyage Planning Guidelines) establishes the berth-to-berth principle. The passage plan should begin from the departure berth (including departure draught, UKC at the berth) and end at the arrival berth (including tidal window for berth entry, air draught under bridges). An ocean passage plan that starts "at sea" and ends "at pilot station" is incomplete. No-go areas: on ECDIS, no-go areas should be entered as electronic exclusion zones (safety depth, safety contour) so the system triggers an alarm if the vessel approaches. On paper charts — clearly hatched with red ink. Abort points: for any passage dependent on weather windows or tidal conditions, the passage plan must identify the last point at which the vessel can safely alter course to an alternative destination without committing to the original approach. After the abort point, the vessel is committed. Open-ocean exemption (option C): SOLAS V/34 applies to ALL voyages. The standard of planning may vary — an ocean passage requires less frequent position-monitoring intervals than a coastal passage — but the requirement for an approved plan, considering weather, hazards, and contingencies, applies universally.

Question 2

As Master approaching a port where tides are required for adequate depth, your UKC policy allows 10% of the vessel's draught. At a draught of 14.5m, 10% is 1.45m. The surveyed depth is 16.2m. Tidal height at arrival is 0.8m. Can you proceed?

Accepted Answer

UKC CALCULATION AND POLICY APPLICATION: BASIC UKC CALCULATION: Available water depth = Chart depth + Tidal height = 16.2 + 0.8 = 17.0m. Vessel draught = 14.5m. Static UKC = 17.0 - 14.5 = 2.5m. UKC policy requirement = 10% of draught = 1.45m. STATIC RESULT: 2.5m available vs 1.45m required — APPEARS SUFFICIENT. HOWEVER — THE MASTER MUST CONSIDER DYNAMIC UKC FACTORS: (1) SQUAT: at speed in shallow water, the vessel will "sink" relative to the water surface due to Bernoulli pressure reduction. For a vessel of this draught in 17m of water (h/d ratio = 17/14.5 = 1.17 — VERY SHALLOW), squat could be 0.5-1.0m at standard speeds. Use squat formula or company guidance; (2) HEEL ALLOWANCE: if the vessel is turning or wind-heeled, the draught at the low side increases. A 2° list or heel adds ~0.5m to draught at the side; (3) TIDE PREDICTION UNCERTAINTY: is the 0.8m tidal height taken from a standard tidal prediction? In practice, meteorological conditions can reduce tidal height significantly. A strong onshore wind can ADD height; an offshore wind can REDUCE it; (4) CHART DATUM UNCERTAINTY: is the 16.2m from a recent survey? Chart datum may differ from actual current depths in silting areas; (5) WAVE RESPONSE: in swells, the vessel pitches and the bow drops lower — "hogging/sagging" effects; DECISION: with static UKC of 2.5m against 1.45m required — the margin appears sufficient. But with squat at speed potentially 0.5-1.0m, the DYNAMIC UKC may be as low as 1.0-1.5m. If squat approaches 1.0m, the remaining dynamic UKC is 1.5m — which is at the policy limit. RECOMMENDATION: reduce speed to minimise squat, use VHF confirmation of current tidal height, arrive at the shallowest point at maximum tidal height. UKC policy — static vs dynamic: the most common error in UKC calculations is treating static clearance as the only consideration. Modern UKC policies (and class society guidelines) require consideration of: (a) squat — mandatory for any shallow water passage; (b) heel — for vessels making course alterations or with asymmetric loading; (c) wave response — in swell conditions; (d) tidal uncertainty — applying a tidal confidence margin. Squat in shallow water (h/d ratio close to 1.2): with h/d = 1.17, this is critically shallow for squat purposes. At 10 knots, the Barrass formula gives squat ≈ (Cb × V²) / 100 × Sf (where Sf is a shallow water factor approaching 2.0 for h/d

Question 3

Your vessel is assigned a voyage from Norway to Murmansk via the Barents Sea in January. As Master, what mandatory Polar Code requirements must be in place before departure?

Accepted Answer

POLAR CODE REQUIREMENTS — MANDATORY FRAMEWORK: The International Code for Ships Operating in Polar Waters (Polar Code) entered into force on 1 January 2017 under SOLAS XIV and MARPOL Annexes I/II/IV/V. The Polar Code is MANDATORY — not advisory. PRE-DEPARTURE REQUIREMENTS: (1) POLAR SHIP CERTIFICATE: the vessel must hold a valid Polar Ship Certificate (SOLAS XIV/10) issued by the flag state or a recognised organisation. This certificate specifies the vessel's Polar Class (A, B, or C) and the operating limitations; (2) POLAR WATER OPERATIONAL MANUAL (PWOM): a vessel-specific PWOM (Chapter 2 of the Polar Code) must be on board, approved by the flag state. The PWOM covers: (a) limitations of the vessel in polar waters; (b) safe speed and sea ice navigation procedures; (c) emergency procedures; (d) communication capabilities; (3) POLAR TRAINED MASTER: STCW requires that masters on vessels in polar waters hold a certificate of completion of: (a) Basic Training for Ships Operating in Polar Waters (for all officers who may take command in polar waters); (b) Advanced Training for Ships Operating in Polar Waters — required for MASTERS and OFFICERS IN CHARGE OF A NAVIGATIONAL WATCH in polar waters (STCW A-V/4); (4) ICE NAVIGATOR: consideration of whether an ice navigator (expert in local ice conditions) should be employed for the Barents Sea in January; (5) SAFETY EQUIPMENT: survival suits rated for polar temperatures (-30°C capability); (6) ENVIRONMENTAL RESTRICTIONS: MARPOL Polar Code restrictions include prohibition on HFO carriage and use in some Antarctic areas (MARPOL Annex I Reg 43A). Polar Code geographical scope: the Polar Code applies to Arctic and Antarctic waters. "Arctic waters" is defined in SOLAS XIV/1 as the waters of the Arctic Ocean north of 60°N (approximately) with specific limits. The Barents Sea is within the Polar Code geographical scope. The key question is whether the specific voyage route enters polar waters as defined. Murmansk is north of 68°N — clearly within the definition. Mandatory nature (option C): the Polar Code is incorporated into SOLAS XIV (which is mandatory) and into MARPOL. It is therefore part of mandatory international maritime law — not guidelines. A vessel operating in polar waters without a Polar Ship Certificate is in breach of SOLAS XIV and would face PSC detention in any port state that is party to SOLAS. Existing vessel exemption (option D): incorrect. Existing vessels were required to comply with the Polar Code from its entry into force on 1 January 2017 (for SOLAS requirements) and 1 March 2017 (for MARPOL requirements). There is no "grandfather" exemption for existing vessels. The Polar Ship Certificate must be obtained for existing vessels operating in polar waters. STCW polar training: the STCW amendments for Polar Code training (STCW Reg V/4 and Tables A-V/4-1 and A-V/4-2) are phased — with transition provisions for masters and officers who were already serving in polar waters. However, since 2018, all masters operating in polar waters must hold the Basic Polar training certificate, and all masters in command in polar waters must hold the Advanced Polar training certificate.