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Electromagnetic log sensor for ship : A Comprehensive Guide. When it comes to maritime navigation, accurately determining a ship`s speed is crucial. This is where the importance of an electromagnetic log sensor comes into play. An electromagnetic log sensor for ship is a device that measures the speed of a ship by measuring the motion of the water around it. In this blog, we will delve into the details of the electromagnetic log sensor, its working principle, benefits, and more. Working Principle of Electromagnetic Log Sensor. An electromagnetic log sensor is based on the principle of Faraday`s law of electromagnetic induction. The device consists of two coils, one of which is stationary and the other is rotating. The rotating coil is mounted on the hull of the ship, partially submerged in the water.