Lost track indication refers to what?

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Lost track indication happens when the radar’s tracking system can no longer maintain a reliable lock on a selected target. The tracker loses continuity of the target’s position and velocity data, usually due to weak returns, rapid or erratic target maneuvering, heavy clutter, or signal loss. When this occurs, the system flags a lost track to alert the operator that the current track is no longer trustworthy and needs reacquisition or manual tracking. It’s a specific indicator tied to the tracking function, not to weather alerts, maintenance modes, or collision warnings. To address it, you’d typically re-acquire the target or switch to manual tracking, and you might adjust radar settings (gain, clutter suppression, or antenna stabilization) to restore a solid track. The other options describe different radar functions or alerts that aren’t about losing a target’s track.