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both the electromagnetic em log and the doppler log are used to measure ship speed while the em log measures only the speed through the water the doppler log can measure speeds both through the water and over the ground the em log system is composed of a sensor known as the measuring rod an amplifier a speed transmitter and an indicator the sensor is surrounded by a magnetic field and is attached to the tip of the measuring rod which protrudes from the shipamp;#39;s bottom into the sea the relative movement of seawater against the magnetic field generates voltage which is measured to determine ship speed the em log also gives accurate speed indications at slower head and a stern the sensor protruding into the sea reduces the influence by the shipamp;#39;s wake and enables highly accurate measurement however the sensor is at risk of colliding with obstacles such as driftwood therefore the newest em logs are flat and the sensor does not protrude from the hull bottom sho