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SURVEYOR'S HANDBOOK · RUNNING A SURVEY PRACTICE

Marine surveyor codes of conduct: what IIMS and NAMS ask of members

UPDATED 12 NOVEMBER 2026 · 3 MIN READ · 4 SOURCES

What the IIMS Code of Conduct, the IIMS Small Craft Code of Practice and the NAMS Code of Ethics ask of marine surveyors: independence, competence, conflicts of interest, confidentiality, insurance and discipline, side by side.

ABYC notes that marine surveying isn't a regulated or licensed industry in the US, and that anyone can call themselves a marine surveyor. That makes the professional bodies' codes the closest thing to a rulebook. Clients, insurers and courts read them as the standard a surveyor is expected to meet. Here is what the two bodies yacht surveyors most often belong to ask of their members.

Side by side

IIMS (Code of Conduct and Small Craft Code of Practice) NAMS (Code of Ethics)
Independence Always independent of the client commissioning the survey; impartial and objective No engagement that creates a conflict of interest or the appearance of one
Competence Only assignments the member is properly qualified for, with up to date knowledge Services only in the surveyor's areas of expertise
Money No commission or hidden payment; any financial interest in the craft disclosed first No payment depending on the sale, the valuation or the referral of repair work
Repairs Not stated No repairs to any vessel the surveyor has surveyed
Confidentiality Advice is confidential to the client; disclosure needs the client's written permission Not stated on its code page
Insurance Small craft surveyors keep professional indemnity insurance in force at a realistic level Not stated on its code page
Discipline Investigation with a right of defence or appeal; warning, suspension or withdrawal Board of Investigation under the bylaws; members abide by its decisions

Independence

The IIMS Code says a marine surveyor will always be independent of the client commissioning the survey, and that members never bias or modify their opinions for personal gain or under pressure. NAMS's credo is that no surveyor takes a position contrary to their own knowledge or opinion.

For a pre-purchase survey this means the report serves the buyer, even when a broker made the introduction. The IIMS Small Craft Code adds that any financial or other interest in the craft must be disclosed to the client before accepting the instruction.

Competence

Both codes limit members to work they're qualified for. IIMS adds keeping technical knowledge up to date and not practising while judgement might be impaired. NAMS puts it in one line: services only in the surveyor's areas of expertise. Taking on a steel hull, a gas system or a damage cause investigation outside your experience is a breach as much as a risk.

What the report must contain

The IIMS Small Craft Code of Practice lists the minimum contents of a condition survey report, including the client, the purpose, the vessel's identification, the date and place, the extent of the limitations with the reason any area wasn't inspected, the defects, the recommendations and a conclusion. For a damage survey, it says opinions on cause shouldn't be given without specific agreed instructions, and must be supported by evidence.

Fees

The IIMS Code asks members not to carry out free surveys and to negotiate fees that recover their costs. The Small Craft Code asks for fee rates that state exactly what they include and exclude. See terms of engagement for putting that in writing, and professional indemnity insurance for the cover the IIMS code requires.

For the qualifications behind membership, see marine surveyor certification.

Frequently asked

Can a marine surveyor repair a boat they surveyed?

Not under the NAMS Code of Ethics, which says surveyors shall not perform repairs to any vessel they have surveyed. It also bars any payment that depends on the sale of a surveyed vessel, its valuation or the referral of repair work.

Can a surveyor share a report with the broker?

Under the IIMS Small Craft Code of Practice, advice to a client is confidential to that client, and disclosure to a third party needs the client's permission in writing.

What happens if a member breaks the code?

IIMS investigates and gives the member the chance to defend or appeal, with sanctions from a written warning to suspension or withdrawal of membership. NAMS appoints a Board of Investigation under its bylaws, and members agree to abide by its decisions.

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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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