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Maritime

Ship Engineer

Licensed officers who keep a vessel's engines, power, and machinery running at sea, where there is no one else to call.

$109,530/yrSteady demand+1% (2024-34) outlookUpdated May 31, 2026
Ship Engineer at work

Why AI won't replace this

  • The repairs happen at sea, where no remote technician can reach the machinery. When a generator or pump fails mid-ocean, a licensed engineer has to physically diagnose and fix it with the parts and tools already aboard.
  • It is embodied, sensory work: hearing a bearing go bad, feeling vibration, smelling overheated oil, and crawling into tight, hot spaces to trace and repair a fault that software cannot touch.
  • Improvising under failure conditions is the core skill. Engineers jury-rig repairs and keep aging equipment running for weeks at a time when there is no spare part and no shipyard within a thousand miles.
  • Coast Guard licensing and international STCW rules require a qualified human engineer to stand watch and be accountable for the engine room, so a credentialed person stays in the loop by law.

How the score is built

WRI 2026.1
9.5/ 10, the WontReplace Index

Both axes below are on the same 0 to 10 scale, and the score is simply 0.55 times the Capability Gap (what current AI cannot do in this work) plus 0.45 times the Deployment Friction (whether AI can actually be put into this role). Every career we list has cleared the AI-safe threshold, which is set at 9.0, so listed careers read 9.0 or higher and the most resistant approach 10.

Read it as a band, not a precise rank: differences smaller than about half a point are within the model's margin.

Capability Gap

What AI cannot do in this work

9.2/ 10
  • Physical and embodied work9.1
  • Real-time relational work8.7
  • Improvisational judgment9.3

Deployment Friction

Whether AI can actually be put here

9.8/ 10
  • Licensing10.0
  • Accountability9.8
  • Public trust9.5
  • Capital and scale10.0

Why this deployment score

Licensed marine engineers physically operate, troubleshoot, and repair propulsion and power machinery at sea where no remote technician can intervene, improvising under failure conditions far from shore.

See the full WRI methodology

Data confidence

What is verified, and what is modeled

Reviewed May 31, 2026

  • Official data

    Pay and wage range

  • Official data

    Outlook and education

  • Official data

    Tasks and skill inputs

Pay, outlook, and task inputs come from BLS and O*NET. The AI-resistance score is the site's WRI model, benchmarked against 19 reference occupations with Spearman -0.65.

View source checklist

Pay and wage range

Official data

Median pay and the 10th to 90th percentile range are generated from the BLS OEWS wage file for SOC 535031.

BLS OEWS 535031

Outlook and education

Official data

The 2024 to 2034 outlook, openings, and typical education path are checked against the BLS Occupational Outlook Handbook.

BLS Occupational Outlook Handbook

Tasks and skill inputs

Official data

The WRI capability side uses O*NET descriptor data mapped to O*NET-SOC 53-5031.00.

O*NET 53-5031.00

AI-resistance score

Modeled

The score is the site's WontReplace Index. It blends O*NET capability limits with deployment friction, then benchmarks the index against prior automation research.

WRI methodology

Career narrative

Editorial review

The plain-English sections explain the official data and the site's thesis. They are not treated as source data.

Review note
Full WRI methodology and limits

About the career

Ship engineers operate and maintain a vessel's engine room. They monitor propulsion engines, generators, boilers, pumps, fuel systems, electrical equipment, and the logs that track machinery performance.

When equipment fails at sea, the engineer on watch has to diagnose and repair it with the crew, tools, and parts on board. The work is physical, noisy, hot, and safety-critical.

How AI is changing this work

AI helps ship engineers through engine-monitoring systems, alarms, condition-based maintenance, and remote diagnostics from shore. These tools can catch wear earlier and improve maintenance planning. They do not repair machinery at sea.

The human work is isolating faults, crawling into machinery spaces, and making repairs with the parts and tools on board. Engineers work under Coast Guard licensing and STCW watchkeeping rules. Automation supports the watch, but a qualified engineer remains accountable.

Work settings & realities

  • Cargo ships, tankers, container vessels, and bulk carriers on coastal and international routes, away from home for weeks or months at a time.
  • Tugboats, towboats, and barges on inland rivers and harbors, often on rotating hitches such as weeks on and weeks off.
  • Ferries, passenger vessels, and harbor craft, which allow more regular schedules and time at home.
  • Offshore supply vessels, drillships, and wind-farm support boats serving the energy industry.
  • The realities: engine rooms are hot, loud, and confined, the work is physical and around-the-clock on rotating watches, and you are isolated at sea where the engineer on duty is the only help available.
  • Almost all of the work is on-site aboard the vessel; there is no remote version of standing an engine-room watch.

Education & licensing

Ship engineers must hold a U.S. Coast Guard Merchant Mariner Credential (MMC) with an engineer endorsement. Many enter through a maritime academy bachelor's degree, while others work up through the engine department with sea time and Coast Guard-approved training. Officers on ocean-going vessels also need an STCW endorsement, and most U.S.-flag mariners need a TWIC.

Specializations & advancement

  • Chief engineer, directing the engine department and accountable for all machinery aboard.
  • Assistant engineer grades (third, second, first), each a licensed watch-standing rank on the way up.
  • Steam, motor (diesel), or gas-turbine endorsements, depending on the propulsion plant the engineer is qualified on.
  • Inland and towing-vessel engineering on rivers and harbors, versus unlimited-tonnage ocean-going service.
  • Specialized vessels such as tankers, LNG carriers, offshore supply boats, or research ships, each with added training endorsements.
  • Shoreside paths after sailing, including port engineer, marine surveyor, technical superintendent, or maritime instructor.

A day in the life

  • Stand an engine-room watch, monitoring gauges, temperatures, pressures, and alarms and logging readings throughout the shift.
  • Perform scheduled maintenance: change filters and oil, inspect bearings, test pumps, and service generators and auxiliary machinery.
  • Respond to breakdowns and alarms, diagnosing the fault and repairing or jury-rigging the equipment with the parts on board.
  • Track fuel, lube oil, and spare-parts inventory, coordinate with the chief engineer and deck officers, and keep the engineering log current.

The honest pros and cons

Pros

  • Strong pay for a job you can enter without a four-year degree, with a median around $109,530 and a clear ladder to higher-paid chief engineer roles.
  • Highly resistant to automation because the hands-on repair and improvisation must happen aboard, at sea, by a licensed person.
  • Skills transfer: experienced engineers move into well-paid shoreside roles like port engineer, surveyor, or superintendent.
  • Rotational schedules can mean long blocks of paid time off at home between contracts.
  • Travel and a sense of purpose: you keep a complex vessel and its crew safely running, often seeing parts of the world.

Cons

  • Long stretches living aboard and away from family, which is hard on relationships and home life.
  • Physically demanding and uncomfortable: hot, loud, confined engine rooms and around-the-clock rotating watches.
  • Real safety risk from machinery, fire, fuel, and being far from emergency help at sea.
  • Licensing is a long process of accumulating sea time and passing Coast Guard exams to advance through the ranks.
  • Overall employment growth is flat, so openings come mainly from replacing engineers who retire or move ashore.

How to get started

  1. 1Enroll in a maritime academy or a Coast Guard-approved engine-department training program to start earning sea time toward an engineer license.
  2. 2Apply for the entry credentials you will need: a Merchant Mariner Credential (MMC), a TWIC, and a merchant mariner medical certificate.
  3. 3Sail in entry-level engine-room roles (such as wiper or oiler) to log documented sea time under licensed engineers.
  4. 4Pass the Coast Guard exams for a third assistant engineer endorsement and add STCW, then build sea time to advance toward chief engineer.

Alternatives and related fields

  • Ship Captain and Mate

    Commands the vessel and its crew; a related licensed maritime officer on the deck side rather than the engine side.

  • Aircraft Mechanic

    Diagnoses and repairs complex propulsion and systems hands-on under strict licensing, much like an engineer ashore and in the air.

  • Wind Turbine Technician

    Maintains and repairs large rotating machinery in remote and offshore locations where no remote fix is possible.

  • Welder

    A hands-on fabrication trade; welding and machining skills are central to repairs in a ship's engine room.

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Frequently asked questions

Will AI replace ship engineers?

No, AI is unlikely to replace ship engineers soon. AI helps ship engineers through engine-monitoring systems, alarms, condition-based maintenance, and remote diagnostics from shore. The human work is isolating faults, crawling into machinery spaces, and making repairs with the parts and tools on board.

How much do ship engineers make?

Ship engineers have a U.S. median pay of $109,530 per year, according to May 2025 BLS OEWS data. The BLS 10th to 90th percentile range is about $57,870 to $165,490 per year. Pay varies by location, setting, experience, credentials, and schedule.

How do you become a ship engineer?

There are two routes. Many graduate from a four-year maritime academy that awards a bachelor's degree plus a Coast Guard credential with a third assistant engineer endorsement. Others come up the hawsepipe, starting in entry-level engine-room jobs, logging documented sea time, completing approved courses, and passing the Coast Guard exams. Either way you build sea time and pass exams to advance toward chief engineer.

What license does a ship engineer need?

You need a U.S. Coast Guard Merchant Mariner Credential (MMC) with an engineer endorsement. Mariners on ocean-going vessels also need an STCW endorsement to meet international standards, most U.S.-flag mariners need a TWIC, and all need a merchant mariner medical certificate. You advance through the engineer ranks by adding sea time and passing further Coast Guard exams.

What does a ship engineer do day to day?

They stand engine-room watches, monitoring gauges, alarms, and machinery and logging readings; perform scheduled maintenance such as oil changes, filter swaps, and inspections; respond to breakdowns by diagnosing and repairing equipment with what is on board; and track fuel, lube oil, and spare-parts inventory while coordinating with the chief engineer and deck officers.

Is being a ship engineer a good career?

It can be, especially if you like hands-on technical work and do not mind time at sea. The pay is strong for a job you can enter without a four-year degree, the skills transfer to well-paid shoreside roles, and the work is hard to automate. The main trade-off is lifestyle: long stretches living aboard and away from home, and physically demanding, around-the-clock work in the engine room.

What is the job outlook for ship engineers?

BLS projects ship engineers employment to grow 1 percent from 2024 to 2034. BLS also projects about 9,500 openings per year (all water transportation workers). The projection should be read with local licensing, location, and employer demand in mind.