Active sonar pulse that lights up nearby ore deposits on your HUD with light-blue rings. The mid-game equivalent of having a metal detector strapped to your spine — invaluable once you're farming Celestine, Mangalloy, and Strontium for the Turbine repair (251–450m tier). Pulse range expands modestly with depth (deeper = the wash is wider).

Unlock: Bioscan the Collector Leviathan in the trench between starter and late-game zones. Approach from above, behind cover, with Camouflage equipped — you cannot scan and escape simultaneously.