A first projection device includes a first laser projector and a first measurement system. A second projection device includes a second laser projector and a second measurement system. The first projection device and the second projection device is interconnected with a controller. The controller is programmed with computer aided design data representative of a large scale work area and coordinates electronic interaction between the first projection device and the second projection device. The first projection device projects a first indicia that is detectable by the second measurement system and the second projection device projects a second indicia that is detectable by the first measurement system. The controller is adapted for determining relative position within three-dimensional coordinate system of the first projection device to the second projection device from the first indicia detected by the second measurement system and the second indicia detected by the first measurement system.