Job description for a marine supervisor in offshore transportation?

Marine Supervisor – Offshore Transportation

Coordinates and controls marine logistics, vessel movements, and SIMOPS around offshore assets to ensure safe, efficient transportation, mooring, bunkering, personnel/cargo transfer, and compliance with marine standards and regulatory requirements.

I. Core Responsibilities (Day-to-Day)

I.1 Vessel traffic management: Plan, brief, and control arrivals/departures within the 500 m safety zone; maintain separation, speed limits, and COLREGs compliance.
I.2 SIMOPS orchestration: Align marine operations with drilling, construction, lifting, ROV, and aviation; maintain and enforce the SIMOPS matrix and exclusion zones.
I.3 Weather window assessment: Interpret metocean forecasts, set go/no-go criteria, and suspend marine operations when thresholds are exceeded.
I.4 Mooring and station-keeping oversight: Review/verify mooring plans, anchor patterns, and DP capability plots; supervise anchor handling and line tensions.
I.5 Towage and escort readiness: Validate tow plans, bollard pull requirements, tug allocation, and emergency response contingencies for offshore transports.
I.6 Cargo and deck operations control: Coordinate backload/load-out, ballast planning for barges, cargo securing, and hatch/chain stopper verification.
I.7 Bunkering and transfer safety: Supervise fuel, potable water, and bulk transfer operations; implement checklists, ISGOTT-equivalent controls, and spill prevention.
I.8 Personnel transfer assurance: Approve and monitor PTAs via basket, gangway, daughter craft, or helo; verify sea state limits and lighting.
I.9 Marine assurance and compliance: Screen vessels (class, certificates, OVID/CMID), conduct pre-entry checks, toolbox talks, and PTW/JSA reviews.
I.10 Incident readiness: Lead on-water emergency coordination, DP alert response, collision avoidance, man-overboard, and pollution control drills.
I.11 Daily reporting: Maintain the marine log, vessel movement plan, deck status, fuel/water inventories, and near-miss/learning records.
I.12 Stakeholder interface: Align plans with offshore installation management, logistics, subsea/ROV leads, and shore-based marine support.

II. Required Competencies

II.A Technical Skills

II.A.1 Nautical rules and regulations: SOLAS, MARPOL, COLREGs, STCW, flag/state requirements for offshore fields.
II.A.2 DP and station-keeping literacy: DP alert states, capability plots, ASOG/WSOG understanding, drift-off/run-off scenarios.
II.A.3 Mooring, towing, and anchor handling: Catenary behavior, line tension management, anchor spreads, and bollard pull verification.
II.A.4 Metocean interpretation: Wave/current/wind limits, squall analysis, loop current/eddies, and set/drift impacts on operations.
II.A.5 Deck operations: Rigging/lifting awareness, cargo securing standards, deck load calculations, ballast and stability basics.
II.A.6 Marine assurance: Vessel audits, crew competency checks, safety management system alignment, and defect remediation tracking.
II.A.7 Emergency response: Oil spill response tiers, SAR coordination, collision/grounding prevention, and ISM non-conformity control.
II.A.8 Documentation: Tow plans, mooring plans, SIMOPS matrices, PTW/TRA/JSA, logbooks, and handover packs.

II.B Soft Skills

II.B.1 Command presence: Clear, concise VHF communications and decisive control of deck/vessel movements.
II.B.2 Situational awareness: Multi-asset traffic picture, hazard anticipation, and resilience under pressure.
II.B.3 Collaboration: Effective interface with Masters, OIM, construction leads, and logistics coordinators.
II.B.4 Risk-based decision-making: Apply ALARP, stop-work authority, and change management.

II.C Physical Demands

II.C.1 Offshore endurance: Work 12-hour shifts in a moving environment; climb ladders, traverse narrow walkways, and work at height.
II.C.2 PPE compliance: Don respiratory, fall-arrest, and immersion gear as required.
II.C.3 Transfers: Safe personnel transfer via boat/helicopter; manage sea-spray, noise, and low-light conditions.

III. Typical Tools, Software, and Equipment

III.1 Navigation/awareness: ECDIS, AIS, ARPA radar overlays, DP consoles (view-only/liaison), electronic nautical charts, beacons.
III.2 Communications: VHF/UHF radios, AIS text, satellite phones, PA/GA, GMDSS distress interfaces.
III.3 Marine analysis: Mooring line calculators, weather routing portals, metocean dashboards, tow configuration templates.
III.4 Deck/transfer: Personnel transfer baskets, motion-compensated gangways, quick-release hooks, tension meters, chafing gear.
III.5 Safety and assurance: Gas detection, spill kits, boom/skimmers, permit-to-work systems, digital JSA/TRA tools.
III.6 Documentation: Marine log systems, vessel movement planners, digital SIMOPS boards, e-permitting suites.

IV. Work Environment

IV.1 Location: Offshore installations, barges, and support vessels; occasional onshore marine base meetings.
IV.2 Rotations: Typical 14/14, 21/21, or 28/28; 12-hour shifts with on-call responsibilities for emergent movements.
IV.3 Conditions: Exposure to weather, vessel motion, noise, and night operations; helicopter and crew boat travel required.
IV.4 Regulatory regime: Operate under site-specific marine procedures aligned with SOLAS/MARPOL/COLREGs and field rules.

V. Reporting Lines and Cross-Functional Interfaces

V.1 Reports to: Offshore Installation Manager (offshore) and Marine Superintendent (onshore) for standards and assurance.
V.2 Directs/coordinates: Vessel Masters (via agreed protocols), Deck Foremen, Rigging Leads, Banksmen, and Marine Coordinators.
V.3 Interfaces with: Drilling/Construction Supervisors, Logistics Coordinators, Subsea/ROV Leads, HSE, Aviation, and Port/Terminal Authorities.
V.4 Handovers: Formal end-of-shift and end-of-hitch handovers with live SIMOPS status, weather outlooks, and vessel line-ups.

VI. Deliverables & Interfaces

VI.1 Deliverables: Daily marine log, vessel movement plan, SIMOPS matrix, weather window assessments, mooring/tow plan verifications, PTW/TRA approvals, incident and near-miss reports.
VI.2 Formal approvals: Go/no-go for marine operations within field limits; acceptance of vessel pre-entry checks and readiness to work.
VI.3 External interfaces: Regulatory notifications (as required), marine warranty surveyors for critical tows/lifts, and search-and-rescue coordination centers during drills/incidents.

VII. Toolchain Snapshot

VII.1 Navigation/DP: ECDIS, AIS, DP capability plots, track pilots, guard zones.
VII.2 Marine engineering: Mooring calculators, tow force estimators, anchor pattern planners.
VII.3 Ops control: Marine movement board, SIMOPS dashboard, e-PTW, JSA library.
VII.4 Compliance: Vessel assurance checklists, certificate trackers, audit templates.

VIII. Key Marine Calculations Reference

Wind load on structure or vessel side

\( F_{\text{wind}} = \tfrac{1}{2}\,\rho_{\text{air}}\,C_{d}\,A\,V^{2} \)

Where: \( \rho_{\text{air}} \approx 1.225\,\text{kg/m}^3 \), \( C_d \) = drag coefficient, \( A \) = projected area, \( V \) = wind speed (m/s).

Current load

\( F_{\text{current}} = \tfrac{1}{2}\,\rho_{\text{water}}\,C_{d}\,A\,U^{2} \)

Where: \( \rho_{\text{water}} \approx 1{,}025\,\text{kg/m}^3 \), \( U \) = current speed (m/s).

Towline tension (resultant)

\( T = \sqrt{H^{2} + V^{2}} \)

Where: \( H \) = horizontal component from environmental loads, \( V \) = vertical component from catenary weight/buoyancy.

Bollard pull check (estimated)

\( \text{BP}_{\text{req}} \approx \dfrac{F_{\text{env}} \cdot \text{SF}}{\eta} \)

Where: \( F_{\text{env}} \) = combined environmental force, \( \text{SF} \) = safety factor (typically 1.3–1.5), \( \eta \) = tug efficiency (0.8–0.9).

Mooring line minimum breaking load (simplified)

\( \text{MBL} \ge \text{SF}_{\text{line}} \times T_{\text{max}} \)

Where: \( \text{SF}_{\text{line}} \) typically 2–3; \( T_{\text{max}} \) = max expected line tension.

IX. Career Ladder

IX.1 Next roles: Senior Marine Supervisor; Tow Master (project tows/heavy lifts); Barge Master; Marine Superintendent; Offshore Installation Manager (marine track).
IX.2 What’s needed to move up:
- Experience: 6–10 complex SIMOPS campaigns, 8–12 rig moves/tows, multiple mooring/anchor spreads, and documented incident-free performance.
- Certifications: STCW II/2 (unlimited or near-coastal Master/OOW as applicable), BOSIET/FOET with HUET, GMDSS (as required), H2S, DP Awareness or DP certification (for DP-oriented assets), lifting/rigging awareness, and spill response.
- Competency proofs: Vessel assurance/audit sign-offs, emergency drill leadership, and verified mooring/tow plan reviews.
IX.3 Progression Trigger: Typically promoted after 8–10 hitches with successful SIMOPS leadership, completion of marine assurance audits, and endorsement from Marine Superintendent plus a competency assessment.