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.