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Trawling means drawing a large seine-like gear with a motor vessel. A modern trawl is a huge and complex gear which with its movements guides the fish towards the end of its bag. The mouth of the trawl can be tens of meters wide and high, and the actual gear can be several hundred meters long. When the trawl is in the water the vessel is steered where the fish is expected to be found. There is a sonar at the mouth of the gear sending signals to the bridge about the amount of fish caught in the trawl. This enables the evaluation of a sufficient trawling time. A modern trawler is equipped with instruments and devices which make the work lighter. The vessel is navigated with aid of the nautical charts and the position of the vessel is shown on a computer screen. The computer also has the routes of earlier fishing trips registered. Electronic devices are also used to locate the fish. Sheltered from the winds, below the deck, are the refrigerated hold and the rooms for handling the fish. Machinery is used for putting out and hauling up the trawl, and conveyors are used for transferring the catch on board the vessel. On a modern trawler, safety at work is also better than earlier, which is important in winter conditions especially. In recent years EU has subsidised the education of fishermen in the use of rescue and fire-fighting equipement.