A laser angle measuring device has a concave detection surface with a plurality of light sensors and an opaque light shield. One or more multi-axis gravity sense potentiometers determine the orientation of the laser angle measuring device, and a GPS receiver determines the location of the laser angle measuring device. The laser angle measuring device is part of a system including one or more laser emitters, each with one or more selectable laser sources. Each laser emitter may also include location and orientation measuring mechanisms.