Useful articles
Automatic Identification System (AIS)
The Automatic Identification System (AIS) is designed to improve the safety of navigation, assisting in the effective navigation of vessels, in environmental matters, and in cooperation with VTS services
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.