The GPS Geo-Scanner scans a chunk for Slimefun's hidden GEO resources. Use it before building extraction machines so you know whether a chunk contains anything worth mining.
Right-click a block in the chunk you want to inspect. The chosen block only selects the chunk; the scan result applies to the whole chunk.
Machines like the GEO Miner and Oil Pump depend on these chunk-based resources. Scanning first prevents wasted setups and helps you compare multiple candidate locations.