What is EM Log?

Em Log is a type of Speed Log which is used to measure the speed of a ship.

Features of EM Speed Log:

  • EM log works on the principle that when any conductor cuts through a magnetic field, a small EMF will be induced within the conductor.
  • In this log, the sea water, which is a good conductor of electricity cuts through a magnetic field and an EMF is induced.
  • Sensors are used to measure the EMF converted onto speed display.
  • Greater the speed of water, greater the emf, greater the displayed speed.