Prevent the collisions
AIS class B Transponder
AIS class A Transponder
The AIS (Automatic Identification System) is useful for ensuring your safety at sea and preventing collisions.
The AIS gives information about the identity, status, position and the route of ships when the radar or visual recognition is not possible (night, foggy weather, weak radar echoes).
AIS is an Automatic Identification System (AIS) - a shipboard short range (typ. 30 nm) identification system used on ships to identify and locate vessels by electronically exchanging data with other nearby ships and with shore-based stations. Position, bearing and speed of nearby vessels can be displayed on a ship’s mapping plotter. AIS also enables maritime authorities to track and monitor vessel movements along their coast if they invest in shore-based AIS receivers. AIS uses VHF radio broadcasts to transmit and receive vital information in regular time intervals.
There are several types of AIS devices:
Class A transceivers
They are designed for usage on large vessels such as cargo ships and large passenger ships. Class A transceivers operate at a higher VHF signal power than class B transceivers and can therefore communicate by more distant vessels. They also transmit more frequently then Class B transceivers. All vessels over 300 gross tons on international voyages and certain types of passenger vessels under the SOLAS must be equipped by Class A transceivers.
Class B transceivers
They are similar to class A transceivers in many ways, but are normally lower cost due to the less strength and performance requirements. Class B transceivers transmit at a lower power and at a lower reporting rate than class A transceivers.
AIS base stations
AIS base stations are used by Vessel Traffic Systems to monitor and control the transmissions of AIS transceivers.
Aids to Navigation (AtoN) Transceivers
AtoNs are transceivers mounted on buoys or other hazards to shipping which transmit details about their location to the nearby vessels.
AIS receivers generally receive transmissions from class A transceivers, class B transceivers, AtoNs and AIS base stations but do not transmit any information about the vessel on which they are installed.