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Speed Logs

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Useful articles


Repair and service of gyrocompasses

Repair and service of gyrocompasses

Gyrocompasses are used in marine navigation and are used to determine the direction of the true meridian (course and bearing).

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Speedlogs is used on ships to measure and display the speed of the vessel.
 
Modern Logs are:
 
Induction - Their action is based on the ability of electromagnetic induction. With the help of a special magnet at the bottom of the vessel creates a magnetic field. The volume of water at the bottom, which is exposed to the magnetic field of the lag can be seen as a set of elementary conductors of electric current, which is induced e. d. p .: value of such e. d. s. It gives an indication of the speed of movement of the vessel.
 
Doppler - Their work is to measure the Doppler shift of the high frequency sonar signal sent from the ship and reflected from the bottom surface.
 
Satellite - Determine the speed of the change of coordinates.