Merchant Navy engineering officer

Merchant Navy engineering officers maintain the mechanical and electrical machinery and instruments on board a ship.

In this guide

What you'll do

Day-to-day tasks

As a Merchant Navy engineering officer, you'll:

  • inspect and test electrical, mechanical and hydraulic equipment
  • read engineering diagrams to carry out maintenance
  • respond to equipment failure and repair faults
  • maintain fuel levels and stocks of spare parts
  • monitor control systems for propulsion, communications and navigation
  • update record management systems

As you move up through the ranks to a senior engineering post, you'll also supervise a team of engineers.

Working environment

Your working environment may be cramped, at height, outdoors in all weathers and you may spend nights away from home.

You may need to wear protective clothing and a uniform.

Career path and progression

The Merchant Navy has clear progression routes through its ranks from engineering officer of the watch to second engineer and chief engineer.

You could also work towards chartered engineer status through professional development with the Institute of Marine Engineering, Science and Technology (IMarEST).

With the skills and experience you’ve gained, you may find onshore positions with:

  • shipping companies
  • port authorities
  • maritime training providers
  • marine engineering companies
  • shipping brokers

You could work for UK companies or for shipping operators based overseas.

You can get information and support for moving to onshore careers from the Marine Society.

What it takes

Skills and knowledge

You'll need:

  • knowledge of engineering science and technology
  • the ability to use, repair and maintain machines and tools
  • problem-solving skills
  • to be thorough and pay attention to detail
  • knowledge of maths
  • the ability to use your initiative
  • excellent verbal communication skills
  • leadership and management skills
  • to be able to use a computer and the main software packages confidently

Restrictions and Requirements

You'll need to:

Most relevant

  • Engineering - Merchant Navy engineering officers maintain and repair the mechanical, electrical, and hydraulic systems that keep a ship running. Understanding engineering principles is central to diagnosing faults, reading engineering diagrams, and keeping propulsion and navigation systems operational.
  • Physics - Merchant Navy engineering officers work with engines, hydraulics, thermodynamics, and electrical systems every day. Understanding forces, energy transfer, fluid mechanics, and how electricity behaves is essential for maintaining and troubleshooting the complex machinery on board a ship.
  • Mathematics - Merchant Navy engineering officers use maths constantly – calculating fuel consumption, power loads, pressure readings, and tolerances for mechanical parts. They also need to interpret technical diagrams and work with measurements to ensure equipment is maintained to precise standards.
  • Electronics - Merchant Navy engineering officers inspect and maintain electronic control systems for propulsion, communications, and navigation. Understanding circuits, sensors, and electronic instrumentation is important for monitoring ship systems and diagnosing electrical faults.

Also relevant

  • Design and Technology - Merchant Navy engineering officers read technical drawings, work with tools and materials, and carry out hands-on repairs in challenging conditions. Practical skills in understanding how components fit together and how to fabricate or adapt parts are valuable on board.
  • Computer Science - Merchant Navy engineering officers monitor computerised control systems that manage propulsion, navigation, and communications on modern vessels. Understanding how these digital systems work helps when configuring, updating, or troubleshooting automated ship management software.
  • Chemistry - Merchant Navy engineering officers manage fuel systems and need to understand combustion, corrosion, and the properties of different fuels and lubricants. This knowledge helps them maintain engines efficiently and prevent damage to machinery from chemical degradation.
  • Geography - Merchant Navy engineering officers work on ships that travel across the world's oceans, encountering different weather systems and sea conditions. Understanding global weather patterns, ocean currents, and how environmental conditions affect a vessel helps them anticipate the demands placed on ship systems.

How to become

You can get into this job through:

  • a sponsored university course
  • an apprenticeship
  • direct application
  • a pre-cadetship course

You can start your career as a Merchant Navy officer cadet (engineering or electro-technical) on an industry sponsored course at a maritime college or university.

You can choose a course that suits your needs from a foundation degree, higher national certificate (HNC) or diploma (HND), up to a degree.

Subjects include:

  • marine engineering
  • marine electrical and electronic engineering

Courses can last up to 3 years and include 8 months of onboard practical training spread over 5 phases. Phases 2 and 4 are spent at sea.

Alongside an academic qualification, you will get a professional qualification known as an unlimited Certificate of Competency. This is internationally recognised and allows you to work on ships anywhere in the world.

You will need to apply directly to a sponsoring company to do an engineer cadetship. Your course costs will be funded by your sponsor and you will receive a bursary payment throughout your training.

Entry requirements for academic courses vary. Sponsoring companies may also have their own entry requirements beyond those needed for the courses themselves.

Entry requirements

You'll usually need:

  • 1 or 2 A levels, or equivalent, for a foundation degree or higher national diploma
  • 2 to 3 A levels, or equivalent, for a degree

More Information

You may be able to apply to do a Small Vessel Chief Engineer Level 4 Higher Apprenticeship, with a maritime company involved in the development of this apprenticeship.

This can take around 4 years to complete and applies to vessels up to 3,000 gross tonnage.

With experience and further training, you may be able to work as an engineer on larger ships.

Entry requirements

You'll usually need:

  • 4 or 5 GCSEs at grades 9 to 4 (A* to C) and A levels, or equivalent, for a higher or degree apprenticeship

More Information

If you have worked in the Royal Navy, or are an experienced Merchant Navy engineering rating, you may be able to apply directly for jobs.

Details of the conversion routes from Royal Navy to Merchant Navy can be found in the Royal Navy Memorandums of Understanding.

If you do not meet the entry requirements for engineering officer cadet training, you can do a pre-cadetship course at a nautical training college.

This lasts around 1 year and helps prepare you for the application for Merchant Navy deck officer training.

Career tips

You can learn more about careers at sea through open days and events held by maritime colleges around the country.

Further information

You can find out more about becoming a Merchant Navy engineering officer from:

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