Introduction

A boat listing contains a lot of information — some of it obvious, some of it industry shorthand that can be confusing if you're new to buying boats. Understanding what each field means helps you compare vessels accurately and spot a good deal (or a red flag) before you even pick up the phone.

Basic Identification

Year Built

The year the hull was completed by the manufacturer. This is not necessarily the year the boat was fitted out or first registered — some production boats are delivered and commissioned a year after the hull date. Older doesn't automatically mean worse: a well-maintained 20-year-old boat from a quality yard can outperform a poorly maintained 5-year-old one.

Make and Model

The make is the manufacturer (e.g., Jeanneau, Bavaria, Hanse, Beneteau). The model is the specific design within that range (e.g., Sun Odyssey 45, Oceanis 46). Searching by model lets you compare like-for-like boats and find owner forums with detailed feedback on known issues.

Flag / Registration

Indicates the country under whose authority the vessel is registered. This affects tax status, documentation required for transfer, and where the vessel can legally sail. A boat on Part I UK Registry has full title documentation; a Part III (Small Ships Register) boat has less formal documentation.

Dimensions

LOA — Length Overall

The total length of the boat from the foremost point of the bow to the rearmost point of the stern, including any fixed overhangs, bowsprits, or swim platforms. LOA is the number used for marina berth allocation and insurance pricing. If a listing shows only "length" without qualification, it usually means LOA.

LWL — Length at Waterline

The length of the hull at the waterline. LWL affects the boat's theoretical hull speed (relevant for displacement sailboats and motor cruisers). A longer LWL relative to LOA means less overhang and typically better sea-keeping in a chop.

Beam

The maximum width of the boat. A wider beam gives more interior volume and deck space but can make marina berthing tighter and affect how the boat handles in a beam sea. Catamarans have a much wider beam than monohulls of equivalent length.

Draft

The distance from the waterline down to the lowest point of the hull (usually the keel tip on a sailboat). Draft determines where you can sail: a boat with a 2.1m draft cannot enter many marinas or anchorages that a shoal-draft boat with 1.2m can. Fin-keel boats typically have deeper drafts than bilge-keel or lifting-keel designs.

Displacement

The weight of water the boat displaces — effectively the total weight of the vessel when fully loaded. Listed in kilograms or tonnes. A heavier displacement means a more comfortable, seakindly motion offshore, but slower performance and higher fuel consumption in a motorboat. For sailboats, the displacement-to-length ratio is used to classify a boat as heavy (bluewater), medium, or light (racing).

Air Draft

The height from the waterline to the highest fixed point on the boat (usually the top of the mast on a sailboat). Critical if you plan to sail under bridges or into certain harbours.

Engine and Propulsion

Engine Make, Model, and Power (HP / kW)

Identifies the engine manufacturer and output. Common marine diesel makes include Volvo Penta, Yanmar, Perkins, and Cummins. More horsepower isn't always better — the engine should be appropriately sized for the hull. An underpowered engine working constantly at high RPM will wear faster than a correctly sized one running at 70–80% load.

Engine Hours

The total hours the engine has run since new (or since last overhaul if stated). This is one of the most important figures in any listing. As a rough guide:

Under 1,000 hours — Low hours for a diesel; excellent if well maintained.
1,000–3,000 hours — Normal working life range; service history is key.
3,000–5,000 hours — Mid-life for a quality diesel; check for major service history (heat exchanger, injectors, impeller, belts).
Over 5,000 hours — High hours; budget for potential overhaul. Not a dealbreaker if serviced correctly.

Always ask when the last service was performed and what was replaced. A 500-hour engine with no service records is more worrying than a 4,000-hour engine with full documented history.

Drive Type

How power reaches the water:

Shaft drive (inboard) — Engine inside the hull, shaft exits through the bottom. Simple and reliable.
Stern drive (I/O) — Inboard engine, outboard-style drive unit. More manoeuvrable but the outdrive requires regular maintenance and antifouling.
Outboard — Engine mounted on the transom. Easy to service, can be replaced without major surgery. Common on smaller vessels.
Pod drive — Joystick-controlled drives through the hull bottom. Excellent manoeuvrability, popular on larger motor yachts.
Saildrive — An inboard engine connected to a drive leg through the hull bottom. Common on production sailboats.

Fuel Type

Diesel is standard on most cruising and offshore vessels — it's safer to store, more fuel-efficient, and diesel engines are more robust for long passages. Petrol (gasoline) outboards are common on smaller powerboats and RIBs. Electric propulsion is increasingly available on newer vessels, especially daysailers and canal boats.

Fuel Capacity

The total volume of the fuel tank(s) in litres or US gallons. Combined with the engine's fuel consumption at cruise RPM, this tells you the vessel's theoretical range. For a motor yacht, range at cruise speed is a key spec.

Sailboat-Specific Fields

Rig Type

Describes the mast and sail configuration:

Sloop — One mast, mainsail and one headsail. The most common rig for modern cruisers.
Cutter — One mast with two headsails (inner forestay for staysail). Good offshore rig.
Ketch — Two masts, the shorter mizzen mast is ahead of the rudder post. Easier sail handling offshore.
Schooner — Two masts, the foremast shorter than the main. Classic look, more complex.
Yawl — Like a ketch, but the mizzen mast is aft of the rudder post.

Keel Type

Fin keel — A single narrow keel, usually with a lead or iron ballast bulb. Deep draft, best upwind performance.
Bilge keel — Two shallow keels set apart. Shallower draft, can dry out upright. Popular in tidal areas.
Lifting keel — Retractable keel for shoal-water access. More complex mechanically.
Full keel — Long keel running most of the hull length. Heavy and seakindly, preferred on traditional offshore boats.

Sail Area

Measured in square metres or square feet. The sail area-to-displacement ratio indicates how powerful (and fast) a sailboat will be in light winds. A higher ratio means a livelier, sportier boat; a lower ratio means a more docile, comfortable passage-maker.

Accommodation

Cabins / Berths

The number of separate sleeping cabins and the total number of berths (sleeping positions). Be sceptical of listings that claim 8 berths on a 35-foot boat — the forward V-berth and saloon conversion berths may be uncomfortable for adults. Always check which berths are genuinely comfortable for long passages vs. in-harbour use only.

Heads (Toilets)

The number of onboard toilets. On longer passages or when sharing a boat with a crew, one head per two people is the practical minimum for comfort. Check the type: manual (pump) or electric, and whether there is a holding tank (required in many coastal zones).

Tank Capacities

Water Capacity

Total fresh water storage in litres. A person typically uses 5–20 litres per day on a boat, depending on whether showers are taken. For offshore passages, carry at least 5 litres per person per day for the planned duration, plus a reserve. Also check if there is a watermaker (desalinator) listed in the equipment.

Holding Tank

Required by law in most inshore and inland waters to prevent sewage discharge. If not listed, check whether the boat has one fitted — retrofitting can be expensive.

Key Equipment to Look For

Good listings will detail onboard equipment. Items that add significant value include:

Chart plotter / GPS — Brand and age matter. Older units may lack chart updates.
AIS transponder — Broadcasts your position to other vessels. Class B is the standard for recreational boats.
VHF radio — Fixed VHF with DSC (Digital Selective Calling) is required in many jurisdictions.
Autopilot — Essential for short-handed offshore sailing or motoring. Check make, model, and condition.
Windlass / anchor winch — Electric windlasses make anchoring far easier, especially solo.
Radar — Useful in fog and for collision avoidance at night.
Life raft — Check the service date. Life rafts must be serviced every 1–3 years depending on type.
EPIRB — Emergency Position Indicating Radio Beacon. Check expiry and registration.
Bow thruster — Electric motor at the bow for easier close-quarters manoeuvring. Very useful on larger vessels.
Generator — Provides 230V/110V power independent of shore power. Check hours.
Solar panels / wind generator — Indicates an offshore-capable setup or liveaboard-friendly installation.
Watermaker — Desalinator for extended passages away from marinas.

Price and VAT Status

Always check whether VAT (Value Added Tax) is included in the listed price. In Europe, boats on which VAT has never been paid (e.g., built before 1985 or imported from outside the EU) will require VAT payment on purchase if used in EU waters. A listing noting "VAT paid" means this liability has already been settled. In the US, check for state sales tax obligations at the point of registration.

Red Flags in a Listing

No engine hours stated — ask why; the meter may be broken or reset.
Very few photos or only exterior shots — often hides interior condition issues.
Price significantly below comparable boats — investigate carefully before getting excited.
Vague location ("Mediterranean" rather than a named marina) — can indicate the boat is not in the water.
No service history mentioned — a responsible owner always keeps records.
"Sold as seen" without explanation — acceptable for classic boats but warrants scrutiny.

How to Read a Boat Listing