Ship automatic identification system (AIS), shipborne voyage data recorder (VDR), electronic chart and information system (ECDIS are independent systems, but they are closely connected. Ship automatic identification system, shipborne voyage data recorder The data obtained needs to be displayed on the electronic chart and information system; the ship automatic identification system and the shipborne voyage data recorder can mutually quote the accuracy of their data, and their standards need to be consistent. Therefore, the International Maritime Organization releases ECDIS, AIS, and VDR. Research, calculation and calibration together. Both AIS and VDR have irreplaceable complementary functions. AIS ships can obtain real-time static data of ships installed and using AIS, such as ship names, call signs, captains, cargo types, and course. Ship navigation dynamic data such as speed, position, relative distance, etc.; VDR can save recorded data and restore and reproduce these data after an accident. The accuracy of the restoration of the incident and the degree of original data provided for the analysis of the cause of the accident are unmatched by traditional methods.

Ship automatic identification system refers to a new type of navigation aid system used in maritime safety and communication between ship and shore, and between ship and ship. It is often composed of a VHF communication machine, a GPS locator, and a communication controller connected to a shipboard display and sensors, which can automatically exchange important information such as ship position, speed, course, ship name, and call sign. While the AIS installed on the ship sends this information outwards, it also receives information from other ships within the VHF coverage area, thus realizing an automatic response. In addition, as an open data transmission system, it can be connected with radar, ARPA, ECDIS, VTS and other terminal equipment and the Internet to form a maritime traffic control and surveillance network. It is an effective means to obtain traffic information without radar detection. Effectively reduce ship collision accidents.