Earthquake Finder will first show you bluetooth and WiFi signals in your vicinity. After determination of the right signal of victim (by telling others in vicinity to move away for a minute), you will mark your first target. Earthquake Finder will simply show you the direction pointer to the target in your screen combined with your GPS position on the map. You only have to move closer and slowly circulate around victim. When pointer from more directions point to one spot, than start to dig on that spot.