How it works for 911 (Score 3, Informative)

This is in daily use at 911 centrals, at least here in Scandinavia. Whenever someone calls 911 (or our local version of it) a trace is automatically performed and the operator can see the approximate position of the caller on the map. This actually works with information from just one base station. The directional antennas will know the sector of the caller and the signal strength is used to calculate the approximate distance. The area in which the caller is positioned is highlighted on the map. No GPS, no triangulation, just one single base station. And no, the police does not have access to the same information, at least not here in Norway. Maintaining this application is part of my current assignment so I do have some first hand experience... -Allan