FreeFlight Systems manufactures GPS Navigators, GPS / WAAS Sensors, Radar Altimeters and SELCAL. FreeFlight Systems, formerly Trimble Navigation Limited business, commercial and helicopter division, is an international leader in satellite guidance and navigation avionics. In addition to the 2101 GPS / Flight Management System popular with business and commuter aircraft worldwide, the company also supplies radar altimeters and selective calling decoders (SELCAL). Constantly striving to produce cutting-edge technology, FreeFlight was the first company to certify a Wide Area Augmentation System (WAAS) receiver for navigation and landing.