Survey and sea trial are where a yacht purchase moves from assumptions to evidence. The buyer, broker, surveyor and technical specialists each have different roles, while the purchase agreement controls the deadlines and decisions that follow.
A yacht can look excellent at the dock and still reveal problems under load. It can also run well while hiding structural, electrical, plumbing or systems issues that require a careful inspection.
The marine survey focuses on the vessel’s physical condition and installed systems within the agreed scope and the access available to the surveyor.
The sea trial evaluates the vessel while systems and propulsion are operating under real load.
The right inspection plan depends on the yacht. Larger, faster or more systems-intensive boats often justify additional specialists.
Evaluates the yacht as a vessel and documents condition, observations and recommendations within the survey scope.
May use manufacturer-specific diagnostics, service history, operating data and technical testing on propulsion or generators.
Makes the underwater hull, running gear, props, shafts, rudders, trim systems and underwater hardware available for inspection.
Stabilizers, gyros, electronics, towers, watermakers, HVAC, paint, composite structures or other systems may justify separate technical review.
Confirm the deposit, inspection window, acceptance deadline, closing target and any vessel-specific conditions in the signed purchase agreement.
Coordinate the surveyor, captain, yard, haul-out, engine or machinery specialists and seller access early enough to stay inside the contract window.
Inspect the vessel at the dock and out of the water where appropriate, documenting condition and material findings.
Complete propulsion, generator or other technical diagnostics within the scope selected by the buyer.
Operate the yacht and test performance, controls, temperatures, vibration and other underway systems.
Separate material defects from normal maintenance, future recommendations and cosmetic observations.
Exercise the acceptance, rejection or other negotiated option available under the purchase agreement before the applicable deadline.
The list changes with the boat, but buyers should think beyond the hull and engines. A modern yacht is a collection of interdependent mechanical, electrical and electronic systems.
Visible hull condition, deck, transom, accessible structural areas, prior repairs and moisture concerns where applicable.
Engines, drives, shafts, pods, lower units, props, cooling systems, steering and controls.
Batteries, chargers, shore power, generators, panels, wiring condition, inverters and high-load systems.
Tanks, filters, pumps, fresh water, waste systems, bilge equipment and leak evidence.
Navigation displays, radar, sonar, autopilot, communications, network integration and helm controls.
Air conditioning, refrigeration, heads, galley equipment, entertainment and accommodations.
Gyros, fins, thrusters, swim platforms, cranes, passerelles and other hydraulic systems where fitted.
Anchoring equipment, windlasses, navigation lights, pumps, emergency gear and required safety equipment.
Survey reports often contain a mix of material defects, safety issues, maintenance recommendations, future service items and cosmetic observations. The buyer should evaluate findings in the context of price, age, condition, intended use and the rights provided by the contract.
Could materially affect safety, reliability, value or the buyer's willingness to proceed.
May be expected service or deferred maintenance rather than a reason to reject the boat.
Can matter to value and ownership experience without being a technical defect.
The purchase agreement controls the buyer's available options, notice requirements, deadlines and deposit treatment. Many professional yacht agreements provide due-diligence rights tied to inspection, survey and sea trial, but buyers should never assume every contract works the same way.
If findings lead to a proposed repair, price adjustment or other change, that resolution should be documented clearly. A broker can coordinate the commercial discussion, but legal questions about contract rights may require legal counsel.
The broker does not replace the surveyor, mechanic or attorney. The broker keeps the transaction moving and helps the buyer connect technical findings to the commercial decision.
Surveyor, yard, captain, technical specialists, seller access and contract timing.
Service records, listing details, equipment questions, survey findings and open transaction items.
Help communicate the buyer's position when material findings affect the decision to proceed.
Keep acceptance, rejection, closing and documentation steps aligned with the signed agreement.
A pre-purchase marine survey is an independent inspection of the vessel’s condition and installed systems for the prospective buyer. The exact scope depends on the surveyor, vessel type and access available on the day of inspection.
The survey evaluates the yacht’s physical condition and systems, while the sea trial evaluates how the vessel and its machinery operate underway. Buyers commonly use both because a boat can appear satisfactory at the dock but reveal operating issues under load.
Often, especially on larger or higher-value boats. A marine surveyor evaluates the vessel as a whole, while an engine or machinery specialist may use manufacturer-specific diagnostics, service records, operating data and specialized testing within the agreed scope.
A haul-out allows inspection of areas that cannot be properly evaluated while the boat is in the water, including the bottom, running gear, props, rudders, shafts, struts, trim systems and other underwater hardware.
The prospective buyer typically chooses and hires an independent surveyor. The buyer’s broker can help coordinate scheduling and logistics, but the surveyor should remain independent and responsible for the scope and conclusions of the survey.
That depends on the purchase agreement and the arrangements made for the transaction. Buyers commonly pay their own surveyor and technical specialists, and haul-out or yard charges may also be allocated to the buyer, but the actual contract and yard arrangements control.
The buyer should review the findings against the purchase agreement and its deadlines. Depending on the contract and the parties’ choices, the buyer may accept the vessel, reject it, or attempt to negotiate a resolution. The agreement controls what rights are available and how they must be exercised.
Refundability depends on the purchase agreement and whether the buyer follows its notice requirements and deadlines. Many yacht purchase agreements include due-diligence protections, but the specific contract language—not a general rule—controls the deposit.
Not necessarily. Survey reports often include observations ranging from material defects to maintenance recommendations. Whether an item leads to a repair, price adjustment, rejection or no change depends on the contract, the seriousness of the finding and what the parties negotiate.
Owner · Co-Founder · Employing Yacht Broker at Coastal Yacht Sales. This guide reflects the practical buyer due-diligence workflow used in professional yacht brokerage transactions and was reviewed September 10, 2026.
Tell us which yacht you are considering. CYS can help coordinate the transaction, schedule the appropriate inspections and keep the process aligned with the purchase agreement.
