A.I.S. It allows ships to communicate their position to avoid collisions.
A computer equipped A.I.S. shows the distance and direction of nearby vessels in a format similar to radar.
The purpose of AIS is to allow ships to communicate their position and other relevant information to other ships or stations can know and avoid collisions.
Class A: Using SOTDMA access and are used in boats.
Class A systems have a VHF transmitter 12.5 W, global positioning system (GPS), two VHF TDMA receivers, DSC VHF receiver, and a type marine interface standard IEC 61162 / NMEA 0183 data it uses to communicate with the ship or other vessel equipment.
Class B: It uses CDMA technology for smaller vessels.
The Class B systems have a transmitter 2 W. The position usually comes from an external navigation system and internal GPS time data which in turn provides backup navigation data.
The navigation information is obtained automatically from the instruments on board.
All ships A.I.S. They provide direction and speed. Also typically offer other information such as speed, rudder angle, pitch, roll, destination and ETA.
A.I.S. it can be used from various platforms:
> Ground-based stations.
> Search and rescue aircraft.
> Large tonnage boats, standard A.I.S. TO.
> Small tonnage boats, standard A.I.S. B.
> Elements of aids to navigation (AtoN).
Advantages of A.I.S.
> Much greater detection range.
> In addition to seeing that there is a boat, many of their identification data as is: Course and speed
> Data displayed on electronic or vector cartography, providing far superior to conventional radar information.
> In addition to providing valuable information, AIS data They are clear and not confused with other white, which does occur in the case of radar (waves, rocks, etc.).
> The price is also very low compared to other safety systems on board.
> All information comes via Internet to any computer on earth, via VHF signals to ships and is free in both cases.
> Very low energy consumption.