Why a Marine Survey Matters — and What It Covers

In a second-hand boat purchase the survey is your strongest card at the negotiating table — and the most expensive step to skip. This article covers what a survey actually inspects, how to read the report, and what to watch during the sea trial.

What does a survey actually check?

A good surveyor works through three layers:

• Structural integrity: impact and osmosis signs on the hull (moisture readings on GRP), caulking and planking on timber boats, rot in beams and frames, keel and rudder attachments. A "survey" without hauling out is not a survey — no verdict on structure is possible without seeing the bottom.
• Machinery and systems: a genuinely cold engine start (a pre-warmed engine hides problems), oil and coolant analysis, gearbox, shaft play, raw-water circuits, electrical panel, battery bank, generator, bilge pumps.
• Rig and safety: rig and sail condition on sailing yachts, windlass, navigation electronics, gas installation, validity of fire and life-saving equipment.

Why is the sea trial a separate step?

A boat that looks flawless at the dock speaks under load. The sea trial checks: temperature and smoke behaviour at full revs, vibration (the first sign of shaft misalignment), steering feel, stability in turns, and on sailing yachts hull noises under rig load. The "sea trial possible" badge on our listings exists precisely so you can plan this step.

How to read the report

A survey report doesn't say "buy" or "don't buy"; it sorts findings into three buckets:

1. Safety-critical items: fatigued seacocks, gas leaks, wet rot — these aren't negotiation material, they're fix-before-sale material. 2. Costly but plannable work: an approaching engine overhaul, standing rigging age, osmosis treatment — what the report gives you is the price tag for these, deducted directly in negotiation. 3. Cosmetics and deferrables: varnish, upholstery, electronics refresh — they enter the budget plan, not the decision.

In practice, the negotiating room a good report creates is worth several times the survey fee — and when the news is bad, it protects you with the right to walk away.

Timing for buyers and sellers

As a buyer, commission the survey after agreeing price in principle, before paying, and make the contract "subject to survey". As a seller, a pre-sale survey of your own boosts listing credibility and speeds negotiation — a strategy we detail in the [selling guide](/en/guide/teknemi-muzayedede-satmak).

How to choose a surveyor, and what drives the fee

Three criteria are enough: independence (no commercial tie to the seller or the selling broker — the buyer pays, so the surveyor works for the buyer), experience with the boat type (the specialist for a timber gulet and for a GRP motor yacht is rarely the same person), and a sample written report (a good surveyor can show a past report with names redacted; a two-page "generally in good condition" note is not a report). Fees scale with length and scope; haul-out and crane charges are usually billed separately to the buyer. The expensive full-scope report is the first line item you win back in negotiation.

Listings on the platform carry "survey available" and "sea trial possible" badges; request either from any listing page in our [yachts for sale](/en/yachts-for-sale). For what comes after the transfer, see the [buying-costs article](/en/blog/turkiyede-yat-satin-alma-rehberi).