Automatic Identification System The AIS transponder is an onboard system operating in the VHF marine band, capable to transmit ship's information such as ID, position, course, direction, origin, vessel type, draft, freight (especially if dangerous), etc.

The collection of cinematic data of the vessel is mainly based on the navigation control by satellite global positioning systems (e.g. GPS / DGPS), suitable both in narrow This technology allows the automatic position dispatch of the position and of the other information relevant to the vessel in a reliable way and with affordable costs, joining a GPS receiver unit and a VHF radio transceiver operating within the band assigned to AIS systems and compliant with the ITU-RM.1371 recommendation. These devices are both included in the AIS transponder which, with reference to Fig. 1, fully performs...

Within the scope of the management and control of the maritime traffic from land control centers for accident prevention and navigation safety it's today growing the demand for technically advanced devices, to provide always better performances in terms of navigation prediction (both onboard and in the shore control sites) and capability and speed in the information distribution. Considering that the management of the operations at sea is also influenced by the local situation and by the risks involved in the marine activities at whatever level, the AIS system stands as a technologically advanced...

According to the IMO requirements for AIS, the transponder is or will become mandatory onboard the following vessels. Existing passenger ships Existing tankers Existing ships Existing ships Existing ships Existing ships Existing ships Transmitted information: General specifications: - Caller identification and name - Antenna location onboard (bow or aft) - Exact ship's position and status - Course over ground (COG) - Speed over ground (SOG) - Optional - roll and pitch (field not included in the basic message) - Optional - yaw angle (field not included in the basic message) - Navigation status...