1. A method, including steps of sending a signal from a 1 st device in a network to a target; measuring a flight time delay in the network in response to the signal; determining, based on the flight time delay, 1 st information comprising a maximum possible distance of said target relative to said 1 st device, a most likely distance of said target relative to said 1 st device, and a probabilistic distribution of most likely distances of said target relative to said 1 st device, with the probabilistic distribution having a value of substantially zero probability at locations beyond the maximum possible distance; combining said 1 st information with 2 nd information wherein the 2 nd information comprises a probabilistic component based on location within a geographic region wherein the probabilistic component is responsive to at least one of the group consisting of physical terrain, population density, and communication bandwidth; and establishing a measure of confidence of the target being in one or more identified geographic regions of elevated confidence based on the 1 st information in combination with the 2 nd information regarding the one or more geographic regions of elevated confidence and establishing a measure of confidence of the target not being in one or more identified geographic regions of reduced confidence based on the 1 st information in combination with the 2 nd information regarding the one or more geographic regions of reduced confidence.