A computer-implemented method for determining geographic locations of a device includes receiving with a GPS receiver within the device, satellite signals from a plurality of GPS satellites, determining with the device, an approximate geographic location in response to the satellite signals, determining in the device, a potential GPS signal reduction condition in response to the satellite signals and to a GPS signal threshold, determining with physical perturbation sensors in the device, physical perturbations, determining with the device, an augmented geographic location in response to the approximate geographic location, the physical perturbations, and a weighting factor, determining with the device, a user display in response to the augmented geographic location, and outputting on a display of the device, the user display.