AIS IMPLEMENTATION
The Automatic Identification System (AIS) is a system used by ships principally for identification and locating vessels. AIS provides a means for ships to electronically data including: identification, position, course, and speed and with other nearby ships. This information can be displayed on a screen. AIS is intended to assist the vessel's watchstanding officers and allow maritime authorities to track and monitor vessel movements. It works by integrating a standardized VHF transceiver system with an electronic navigation system, such as a LORAN-C (LOng RAnge Navigation Version C) or Global Positioning System receiver, and other navigational sensors on board ship.
This system is required and mandatory for all the ships with 300 GT (gross Tonnage) or more and all the passenger ships regardless of size as regulated by the International Maritime Organization's (IMO) International Convention for the Safety of Life at Sea (SOLAS). It is estimated that more than 40,000 ships currently carry AIS class A equipment.
This system is required and mandatory for all the ships with 300 GT (gross Tonnage) or more and all the passenger ships regardless of size as regulated by the International Maritime Organization's (IMO) International Convention for the Safety of Life at Sea (SOLAS). It is estimated that more than 40,000 ships currently carry AIS class A equipment.
AIS transponders automatically broadcast information, such as their position, speed, and navigational status, at regular intervals via a VHF transmitter built into the transponder. The information originates from the ship's navigational sensors, typically its global navigation satellite system (GNSS) receiver and gyrocompass.
Other information, such as the vessel name and VHF call sign, is programmed when installing the equipment and is also transmitted regularly. The signals are received by AIS transponders fitted on other ships or on land based systems, such as VTS systems. The received information can be displayed on a screen or chart plotter, showing the other vessels' positions in much the same manner as a radar display. The AIS standard describes two major classes of AIS units:
Class A - mandated for use on SOLAS Chapter V vessels (and others in some countries).
Class B - a low power, lower cost derivative for leisure and non-SOLAS markets.
Class A - mandated for use on SOLAS Chapter V vessels (and others in some countries).
Class B - a low power, lower cost derivative for leisure and non-SOLAS markets.
Other variants are under development specifically for base stations, aids to navigation and search and rescue, though they will all be derived from one of the existing standards and inter-operate with them.
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