Trimble Navigation, Ltd., headquartered in Sunnyvale, California, makes Global Positioning System (GPS) receivers, laser rangefinders, Unmanned aerial vehicles (UAVs), and inertial navigation systems. As of 2012, the company has 6561 employees who are located in about 30 countries. Since 1999, Trimble's revenues have grown from approximately $270 million to over $2.0 billion in 2012.