1. A method for locating several terminals in a wireless network comprising several base stations; the method comprising: maintaining a probabilistic model of the wireless network, the probabilistic model indicating a probability distribution for signal values of several base stations at several locations in the wireless network; for each of the several terminals: the terminal making a set of observations of signal values of a subset of said several base stations; determining an estimate of the terminal's location based on the probabilistic model and the set of observations; the terminal recurrently measuring at least one additional item, wherein the at least one additional item is not used for determining the estimate of the terminal's location; the method further comprising: collecting information tuples, wherein each information tuple indicates the at least one additional item and the time and the estimate of the terminal's location at which the at least one additional item was measured; storing and organizing the information tuples; using the stored information tuples to determine the at least one additional item as a function of time and location in the wireless network.