Which statement best describes AIS purpose?

• A. Transmits weather data
• B. Controls engine speed
• C. Transmits vessel identity, position, speed
• D. Replaces radar

Answer: (C)

Automatic Identification System (AIS) is designed to provide navigational awareness by broadcasting a vessel’s identity and movement data to nearby ships and shore stations. It continuously transmits the vessel’s unique identifier, name, position, course, speed, and other status information. This enables others to know who you are, where you are, how fast you’re moving, and where you’re heading, which helps with collision avoidance and traffic monitoring. Weather data transmission isn’t the primary purpose, and AIS does not control engine speed. It also doesn’t replace radar; radar remains essential for detecting all targets, including non-AIS-equipped ones. So the best description is that AIS transmits vessel identity, position, and speed.