Yacht Sea Trial Checklist: What to Check Before You Buy a Yacht

A sea trial is the working test drive of a yacht, the point where you and your surveyor put the boat through its paces on the water before money changes hands. A good yacht sea trial checklist covers how the engines and steering behave under load, how the yacht handles at cruising and full speed, and whether every major system (electrical, plumbing, navigation, safety) actually works away from the dock. Run it after your offer is accepted but before the sale is final, so anything you find can still shape the price or kill the deal.

At Turkey Boats we attend sea trials with buyers along the Turkish coast every season, and the pattern is consistent: dockside a yacht can look perfect, yet only a trial under real conditions shows how she truly performs. This guide walks through what to check, who does what, and how the trial fits with the survey.

What a sea trial is and where it sits in the buying process

The sea trial is one leg of your due diligence, alongside the out-of-water survey and the paperwork checks. The usual order is: agree a price subject to survey and trial, haul the boat for the hull and structural survey, then run the sea trial for the moving parts and systems. Many buyers combine the trial with an engine survey so the specialists can log temperatures, pressures and readings while the yacht is working.

Think of it as evidence gathering, not a pleasure cruise. You are there to confirm the boat matches its listing and to surface faults while you still have negotiating room. If you are still comparing candidates, browse current yachts for sale in Turkey before you commit the time and cost of a trial on any one boat.

Before you leave the dock

A surprising share of the checklist happens while the yacht is still tied up. Arrive early and work through the cold-start and static items before the engines warm.

• Cold engine start: watch the first start of the day. Excessive smoke, hard starting or unusual noise on a cold engine tells you more than a warm restart.
• Fluids and belts: check oil and coolant levels and colour, look for leaks under the engines, and inspect belts and hoses for wear.
• Bilges: dry, clean bilges are a good sign. Standing water, oil sheen or salt crust points to leaks worth tracing.
• Battery banks and charging: note the state of the batteries and confirm the charger and shore power are working.
• Safety gear: log the liferaft service date, flares, fire extinguishers, EPIRB, bilge pumps and gas system. Expired safety equipment is common and easy to price in.

The core yacht sea trial checklist on the water

Once you are clear of the harbour, give the yacht enough time and enough throttle to reveal how she behaves. A rushed twenty-minute loop at half speed proves very little. Plan for a couple of hours if the boat and weather allow.

Engines and running gear

This is the heart of the trial. Run the engines up to full rated RPM and confirm they reach it; a boat that cannot make its rated revs may have fouling, propeller or engine issues. Watch the temperature and oil pressure gauges hold steady at cruising load, listen for vibration through the shafts, and check the exhaust for heavy smoke once warm. Note fuel consumption if the instruments allow, and test forward, neutral and reverse in each gearbox.

Steering, handling and manoeuvring

Test the steering lock to lock, check the autopilot engages and holds a course, and feel how the yacht turns and tracks. Do slow-speed manoeuvres and, if fitted, test bow and stern thrusters. Back down hard to confirm the gearboxes and mountings take the load without alarming noise.

Electronics and navigation

Power up every screen: chartplotter, radar, depth sounder, GPS, VHF, AIS and instruments. Confirm they read correctly underway, not just that they switch on. Test the radar against a known target and the depth sounder against charted depths.

Systems and comfort

Underway is the time to test the systems that only load up at sea: the generator under electrical load, air conditioning, refrigeration, watermaker, heads and holding tanks, freshwater pumps, windlass and anchor, and any hydraulics such as a passerelle or crane. On a sailing yacht, hoist and set every sail, run the furling gear, and load the winches and rigging.

Who runs the trial and who pays

The current owner or their captain usually operates the yacht, since they know her systems and the sale is not yet complete. You attend as the buyer, and your independent surveyor attends to record findings. Bringing your own qualified surveyor and, for a larger yacht, a separate engine specialist is the single most valuable thing you can do; their notes turn impressions into a defensible list.

On cost, practice varies by boat and broker, but as an indicative guide the buyer typically covers the survey and any lift or haul-out, while fuel and crew for the trial are often the seller's responsibility. Confirm who pays what in writing before the day, along with the planned route and how long you will be out, because these figures and arrangements vary by yacht, location and season. As of the time of writing, a short haul-out plus survey and sea trial on a mid-size yacht commonly runs into a few thousand euros; treat that as money that protects a far larger purchase, and confirm current quotes with the yard and surveyor.

What a good result looks like, and what should worry you

No used yacht is flawless, and a trial that returns a tidy snag list is normal and useful. The goal is not a perfect boat but a known boat: you want the faults on paper so you can decide whether to fix, renegotiate or walk away.

If the weather forces a short or sheltered trial, note that the test was limited and consider a second run rather than signing off on partial evidence. A seller who refuses a proper trial, or insists on a token loop at low speed, is telling you something.

After the trial: turning findings into decisions

Once the surveyor issues the report, you have three levers. You can ask the seller to rectify faults before completion, renegotiate the price to reflect the work, or withdraw if the findings are serious. A well-drafted offer that is conditional on a satisfactory survey and sea trial keeps all three options open, which is why the sequence matters.

Remember too that a yacht is generally a depreciating asset with real running costs (berthing, maintenance, insurance, crew, winterising and fuel), so the trial is also your chance to gauge how much upkeep the boat will demand. Separately from the trial, confirm the boat's VAT status, title and any liens, and the flag and registration position with the right professional, because these do not show up on the water. If you are buying to keep the yacht in Turkish waters, our team can walk you through survey, sea trial, negotiation and berthing as one process.

The sea trial is where a purchase stops being a listing and becomes a real boat with real strengths and faults. Attend it, bring your own surveyor, work the checklist methodically, and let the water tell you the truth before you sign. If you would like an independent broker in your corner for a trial on the Turkish coast, book a free, no-obligation consultation and we will help you plan it.

Disclaimer: This article is for general information only and does not constitute legal, tax, or survey advice. Figures and rules change and vary by vessel and situation; confirm the current details and your own position with a qualified professional before acting.