What information can AIS provide to enhance ARPA tracking when radar measurements are poor?

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The main idea here is that AIS provides a cooperative source of target identity and motion data to support ARPA when radar signals are weak or incomplete. AIS broadcasts include the vessel’s identity (MMSI and name) plus key kinematic information—position, speed over ground, and course over ground—along with a timestamp. When radar measurements are poor, ARPA can use this AIS information to confirm exactly which vessel is being tracked and to refine the track by incorporating the AIS speed and course data. This helps maintain track continuity, reduces drift, and fills gaps between radar fixes with an independent data stream. It’s a practical enhancement, though AIS data can have limitations (not all vessels transmit, data can be delayed or inaccurate, or misreported). The other options don’t provide the same direct benefit to tracking: weather data isn’t an AIS payload used for ARPA, cargo manifests aren’t part of ARPA tracking data, and AIS does have a useful role in reinforcing ARPA accuracy.