G™:Trilateration

In 3D Euclidean space, the position of a point is uniquely determined by its distance from three other (distinct, non-colinear) points (mostly; in some cases there may be two solutions). Trilateration is the process of finding a point from three of these distance/point pairs - strictly speaking, this is "true range" trilateration (or, more generally, multilateration), and the more widely used pseudo-range trilateration (multilateration) uses four distances instead. GPS, in ComputerCraft and otherwise, is based on this process, though ComputerCraft GPS is free of almost all noise and sources of error and thus uses much simpler algorithms and can achieve near-perfect accuracy easily.