Abstract: The accuracy of a location determination mechanism may be determined as compared to another location determination mechanism. Dialing 9-1-1 on a mobile communication device may trigger location determination of the device via a GPS-based mechanism. The location information may be time stamped. The location and time information may be provided to a network. The network may determine the location of the device via network infrastructure. The network may time stamp this second set of locations. The determination of the locations of the device via GPS and via the network infrastructure may occur approximately during the same time frame. The first set of locations and the second set of locations may be time aligned, and the differences between the two sets may be utilized to determine the accuracy of network-infrastructure-based location determination mechanism as compared to the GPS-based location determination mechanism.