A trawler is a displacement boat built for range and comfort more than speed. Its engines run for long hours at low rpm, its tanks are large and its systems are set up for long passages. The survey reads it with that use in mind.
What stands out on a trawler
- Engines and hours
- High hours are normal on a trawler; what matters is the service record and the marks of long running at low rpm.
- Fuel tanks
- Large and often close to the hull; corrosion, leaks and water at the bottom.
- Cooling and exhaust
- Wet exhaust or a dry stack; keel cooling on some boats.
- Stabilisers
- Fin stabiliser seals and hydraulics.
- Teak decks and windows
- Large decks and big windows; leaks reaching the interior.
- Generator and power
- Independence on long passages; battery bank and charging.
On sea trial
A long run at cruising rpm: stable temperatures, vibration and fuel consumption. Stabiliser operation and the boat's behaviour in waves.
The logic of a range boat
Trawler-type boats are designed for long range and seaworthiness rather than speed. A displacement hull, a diesel running at low rpm and large fuel tanks define them. The survey follows that logic: the systems of a boat meant to stay independent of the shore for long periods are assessed in more detail than those of a day boat.
Large tanks
Water and sediment build up in large fuel tanks over time, more so on boats used little for long periods. Tank connections, a bottom sample, filters and visible tank surfaces are examined. On older boats, tank material and age matter for the budget of a possible replacement.
Single engine and protection
Many trawlers have a single engine, so its reliability is vital; cooling, fuel and electrics are examined with that in mind. Where the propeller is protected behind the keel, the keel and propeller area are checked. Some boats carry a secondary propulsion arrangement; if fitted, it is tried too.
Roll and stabilisation
Displacement hulls tend to roll, so many trawlers carry stabilisers or paravanes. Their condition and service records are assessed separately.
Living systems
Trawlers built for long stays aboard commonly have a generator, watermaker, heating and large battery banks. Each is run and measured.
Sea trial
The trial includes a long run at cruising rpm, with temperatures, consumption and vibration watched throughout.
Age and history
Many trawlers on the market are older boats with long histories; service records and earlier surveys matter all the more.
The buyer's plans
How long and in which waters the buyer plans to stay aboard sets which systems the survey examines most deeply. If long passages are planned, the spares list and self-sufficiency systems are assessed separately in the report. On an older trawler, wiring, tanks and exhaust are often first in line for renewal; their condition lets the purchase budget be set realistically.
During the long run on the sea trial, the engine room is scanned with the thermal camera; exhaust, cooling connections and switchboard show their true temperatures then. Fuel consumption is measured on the same run and becomes the basis for working out the boat's real range, which on a trawler is the whole point of owning one.
Range is worked out with a reserve deducted and sea conditions allowed for, never on flat-calm figures alone.
A realistic range figure is the foundation of every passage plan.