"Don't let the complicated-sounding name fool you, this method is actually quite simple. Simply surround the location you want to find with four probes, one on each side. Give a large overlap area, as this overlap of all four probes is where you're aiming to scan. The reason for using four probes is that the new scanning system uses something called quadlateration (or quadrilateration/multilateration), which is like a 3-D version of how GPS works. The details of how it works aren't that important to know, the important part is that it means to get a lock on something you need four probes overlapping it. For added strength or area coverage, you can add additional probes vertically above or below the others."