Marine technology that transmits a vessel’s unique identifier, position, course, and speed over ground to other AIS-equipped vessels and shore-based receivers. The main purpose of AIS is to increase safety of navigation and enhance collision avoidance by providing real-time vessel information to all AIS-equipped vessels in the vicinity.

AIS is a mandatory requirement for larger commercial vessels, but smaller vessels can also benefit from its use. AIS signals are transmitted via VHF radio frequency, and the information can be displayed on a chart plotter, radar, or other AIS receiver.

In addition to its safety benefits, AIS is also used for vessel traffic management, search and rescue operations, and route planning. It allows vessels to be tracked and monitored by maritime authorities, improving maritime safety and security.