Global positioning system GPS receivers 13 Wireless communication systems 13 Technological innovations 12 Design and construction 8 Intelligent control systems 8 Wireless LANs 8 Mobile communication systems 6 Autonomous robots 4 Global system for mobile communications 4 Mobile robots 4 Inertial navigation 3 Radio frequency 3 Remote control 3 Amateurs, manuals 2 Amateurs, manuals 2 Artificial satellites in navigation 2 Artificial satellites in telecommunication 2 Computer hackers 2 Geographic information systems 2 Ionosphere 2 Location-based services 2 Mobile computing 2 Programmable controllers 2 Programmable logic devices 2 Radio 2 Receivers and reception 2 Remote sensing 2 Space industrialization 2 Arduino (Programmable controller) 1