What is the purpose of AIS in COLREGs navigation?

• A. To provide identity, course, speed, and likely CPA to assist other vessels in collision avoidance.
• B. To provide weather updates to mariners.
• C. To monitor engine status and fuel efficiency.
• D. To replace the need for radar and visual lookout.

Answer: (B)

The key idea is that AIS is a tool for sharing information about vessels to improve collision avoidance. It broadcasts each vessel’s identity (like MMSI and name), type, position, course, speed, and navigational status, along with calculated data such as the closest point of approach and the time to that approach with other AIS-equipped ships. This stream of data helps mariners quickly assess potential crossing, overtaking, or head-on conflicts and decide the appropriate action under the COLREGs. AIS enhances situational awareness and supports safe decisions, but it doesn’t replace radar or the need for a visual lookout. It also isn’t a source of weather updates, and it doesn’t monitor engine status or other non-navigation information.