Offshore vs merchant navy
Two very different jobs: offshore (OSV, AHTS, PSV, DP-class) supporting oil + gas + wind installations vs merchant navy (container, bulker, tanker, gas) moving cargo between ports. Contract pattern, pay, lifestyle, certificates.
Side-by-side
| Criterion | Offshore OSV, AHTS, PSV, construction support, wind-farm — DP class 1/2/3 | Merchant navy Container, bulker, tanker, gas, ro-ro, general cargo, cruise |
|---|---|---|
| Contract pattern | Rotational 28/28 (North Sea), 35/35, 6-week/6-week (Brazil) | Trip-based 3–6 months on, 2–3 months off |
| Time at sea per year | ~6 months total but in 4-week blocks | ~7–9 months total in single long blocks |
| Pay-per-day (indicative USD officer) | $300–600 (North Sea DP Master) | $200–400 (typical merchant Master) |
| Annual earnings | ~$80–150k (Master, North Sea) | ~$110–180k (Master, merchant) |
| Required certificates | BOSIET + FOET + OPITO medical + OOW/CoC + DPO (where DP class) | Standard STCW + flag-state medical + role-specific endorsements |
| Industry demand | Cyclical — tied to oil price + wind capex | Stable + slowly expanding |
| Work environment | Close to platforms, weather windows critical, station-keeping precision | Open ocean transits, cargo + port operations |
| Family pattern | More predictable home time (rotational) | Long absences but longer leave blocks |
Who each suits
- Offshore
Seafarers who want predictable home rotation (28/28), who can build DP-Op qualifications, and who are comfortable with cyclical demand tied to commodity prices.
- Merchant navy
Seafarers wanting steady long-term career progression across many vessel types + routes. Better for those wanting to specialise (tanker, LNG, cruise) over the long arc.
Pros and cons
Offshore
Pros
- Predictable home time.
- Pay-per-day premium for DP qualification.
- Project work + technical challenge.
Cons
- Cyclical demand.
- BOSIET + medical regime adds cost.
- North Sea weather + winter offshore conditions.
Merchant navy
Pros
- Steady long-term career arc.
- Wider variety of vessel + cargo experience.
- Higher annual earnings potential (longer sea time per year).
Cons
- Long unbroken absences from home.
- Less predictable contract end.
- Trip-based pay model.
Common misunderstandings
- 'Offshore always pays more.' Per day yes; per year, merchant Master often wins.
- 'You can move freely between offshore and merchant.' BOSIET + DPO are offshore-specific; merchant routes don't credit them. Reverse direction is fine — your CoC carries.
- 'Wind-farm offshore is the same as oil + gas.' Crew transfer vessels (CTV) and SOVs are a distinct sub-fleet with shorter trips and different certification expectations.
FAQ
- Is the offshore wind market replacing oil + gas?
- Growing but not yet replacing. Wind capex is rising; oil + gas remains the larger employer of offshore crews in 2026. Both will coexist; CTV / SOV work is the fastest-growing sub-segment.
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Primary sources
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