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английский) 1:
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Lag is a device designed to measure the speed of the vessel. The principle of operation of modern devices based on the measurement of water flow, or sonar seabed. The most common logs — Doppler (Doppler effect is used), induction and correlation. Currently on ships of maritime transport fleet apply induction, hydrodynamic and radiodoplerovskie logs, measure the speed relative to the water.
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