Which data items does AIS provide for validating ARPA tracks?

Which data items does AIS provide for validating ARPA tracks?

• A. Radar frequency and resolution
• B. Target identity, course, speed, and position
• C. AIS message length and broadcast interval
• D. Weather and sea state

Answer: (B)

AIS data used for validating ARPA tracks come from the vessel’s own transmitted information, which includes who the vessel is and how it’s moving. The important items are the target’s identity (such as MMSI and vessel name) and its motion/position data (course over ground, speed over ground, and current position). This combination lets you confirm you’re tracking the correct vessel and check that the radar track makes sense over time: the AIS-reported position should align with the radar position, and the AIS course and speed should produce a plausible motion when compared with the radar track. Radar frequency and resolution are characteristics of the radar system, not AIS data. AIS message length and broadcast interval are about how AIS data is transmitted, not the information the vessel provides about itself. Weather and sea state are environmental data, not part of AIS.

AIS data used for validating ARPA tracks come from the vessel’s own transmitted information, which includes who the vessel is and how it’s moving. The important items are the target’s identity (such as MMSI and vessel name) and its motion/position data (course over ground, speed over ground, and current position). This combination lets you confirm you’re tracking the correct vessel and check that the radar track makes sense over time: the AIS-reported position should align with the radar position, and the AIS course and speed should produce a plausible motion when compared with the radar track.

Radar frequency and resolution are characteristics of the radar system, not AIS data. AIS message length and broadcast interval are about how AIS data is transmitted, not the information the vessel provides about itself. Weather and sea state are environmental data, not part of AIS.