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SURVEYOR'S HANDBOOK · BECOMING A SURVEYOR

How to become a yacht surveyor in the UK: IIMS, YDSA and the Boat Safety Scheme

UPDATED 10 NOVEMBER 2026 · 3 MIN READ · 5 SOURCES

How to become a marine or yacht surveyor in the UK: the IIMS distance learning qualification, YDSA membership and report assessment, coding surveyor work, the Boat Safety Scheme examiner programme and insurance.

In the UK, private yacht work goes to surveyors whose reports insurers and buyers trust, and in practice that means membership of a professional body. Two of the main ones for yachts are the International Institute of Marine Surveying (IIMS) and the Yacht Designers and Surveyors Association (YDSA). The general route, from boat trade to first survey, is in how to become a marine surveyor.

The IIMS qualification

The IIMS says it's the only professional body of its kind that awards its own marine surveying qualifications. The Professional Qualification in Yacht and Small Craft Marine Surveying is studied by distance learning. You pass four core units and four specialist units of your choice, from ten, and have two years to finish. Four more specialist units take you to the Advanced Professional level. The IIMS calls both equivalent to a level 4/5 qualification.

It suits people who already work with boats and want the surveying side in a structured form, while they keep working in their trade.

YDSA membership

The YDSA covers surveying and design of craft under and over 24 metres, excluding ships and cargo vessels. Members get a code of practice, a sample survey report pack, a standard survey contract and an insurance scheme. Membership involves assessment and feedback on the reports you submit, so your report writing is judged before you're admitted. Its Articles require members to hold professional indemnity insurance, and the YDSA ends membership if a member is found without it.

Two kinds of work open up from there:

  • Coding surveyor. To carry out compliance examinations on small commercial vessels under the UK codes, you need to be an Accredited YDSA member, or at an equivalent level with another certifying authority, and follow its application process.
  • Measurer for registration. Tonnage and measurement surveys for registration need YDSA membership first.

Boat Safety Scheme examiner

On canals and rivers, boats need a Boat Safety Scheme examination. Examiners train through the BSS New Examiner Training Programme: around 16 online modules, two weeks at the BSS field craft training centre in Norwich, gas and electrical training, and a field assessment. The BSS invites people with practical experience of marine engineering or boat systems to apply when an intake opens.

It assumes you know boats already. The BSS lists marine engineering and boatbuilding qualifications, from City & Guilds certificates and NVQs to HNDs and degrees, as significant for the role, and says the programme doesn't teach boat construction or marine engineering. Examining builds the habits of surveying, and many examiners survey too.

A UK example

Martin Smyth studied Ship Science at the University of Southampton after technical college. His first job was in a design office, as a junior draughtsman who also made models, where he learned the practical side of boat design. Now self-employed, he surveys "just about anything that floats", and damaged cargoes too, with the occasional design commission. More paths like his are in how surveyors got into the job.

Practical steps

  1. Get hands-on time with boats, in a yard or at sea.
  2. Start the IIMS qualification, or ask the YDSA what it needs to see from you.
  3. Work alongside an experienced surveyor and keep copies of your reports.
  4. Arrange professional indemnity insurance before you take paid work.
  5. Apply for membership, then decide whether coding or BSS work fits.

Frequently asked

Do you need a qualification to be a yacht surveyor in the UK?

For private yacht surveys, clients and insurers look for membership of a body such as the IIMS or YDSA. Coding surveys for small commercial vessels and Boat Safety Scheme examinations need you to be approved for that work.

Can I study marine surveying online in the UK?

Yes. The IIMS Professional Qualification in Yacht and Small Craft Marine Surveying is studied by distance learning, with four core and four specialist units to pass within two years.

How do I become a Boat Safety Scheme examiner?

Through the BSS New Examiner Training Programme, when it's taking applications. It assumes you already know boat systems, and includes online modules, two weeks of field training and an assessment before you can register as an examiner.

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Terms you'll use

Full glossary
UNDERWATER GEAR

Anode

A block of zinc, aluminium or magnesium fitted to a boat's underwater metal that corrodes in its place, so the propeller, shaft and fittings last.

ENGINE AND FUEL

Anti-siphon valve

A small valve at the top of a petrol tank's fuel outlet that stays closed unless the engine's fuel pump is drawing, so a broken fuel line can't siphon the tank into the bilge.

ELECTRICAL

Battery management system

The electronics that watch a lithium battery's voltage, current and temperature and disconnect it before it's damaged.

ELECTRICAL

Battery switch

The heavy rotary switch that connects or isolates a boat's batteries, often marked 1, 2, Both and Off.

PLUMBING AND TANKS

Bilge pump

An electric or manual pump that removes water from the lowest part of the hull, usually started automatically by a float switch when water rises.

ELECTRICAL

Bonding system

Wires, usually green, that connect a boat's underwater metal fittings to each other, the anodes and the DC negative.

EUROPEAN PAPERWORK

Brodica

The Croatian term for a boat over 2.5 m up to 15 m, registered and inspected by the harbourmaster; craft over 15 m are yachts surveyed by the Croatian Register of Shipping.

HULL AND STRUCTURE

Bulkhead

A wall across or along the inside of a boat, bonded to the hull and deck, that stiffens the structure and often carries rig or engine loads.

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