When an ARPA-tracked target maneuvers: First indication of a maneuver will probably be seen on a persistence or afterglow feature if your ARPA has one.

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The first sign of a maneuver on an ARPA-tracked target is typically the persistence or afterglow echo on the radar display. Persistence keeps previous echoes on the screen for a short time, forming a visible trail of where the target has been. When the target changes course or speed, that trail will begin to show a deviation or kink, and the predicted track will no longer align with the actual movement. This visual cue lets you notice the maneuver early, even before the ARPA’s automatic trackers fully update or before new data is processed.

AIS messages can provide speed and course information, but they are external inputs that may be delayed or inconsistent; they aren’t the immediate visual cue on the radar screen that signals a maneuver. Weather radar images are for detecting precipitation and unrelated to target maneuvers on ARPA. Vessel name tags identify a target but don’t convey motion or changes in trajectory.