Aerospace products and equipment includes parts, machinery, tools, instruments, and systems for airplanes, gliders, helicopters, spacecraft, unmanned aerial vehicles (UAVs), and other aircraft.
Navigational instruments and avionics include GPS devices, compasses, chronometers, radar units, and other instruments for orientation, relative position and absolute position (longitude / latitude).
Global positioning system (GPS) modules and GPS devices are radio-navigational devices that provide accurate position information about objects on Earth, based on information from orbiting satellites.
Level sensors are used to detect liquid or powder levels, or interfaces between liquids. There are two basic level-measurement types: continuous and point or multi-point.
Radar systems and radar products have synchronized transmitters and receivers that send radio waves and detect their reflections from objects, surfaces or sub-surface structures.
Telephones and cellular phones convert voice or other sound signals into a form that can be transmitted to another device that receives and reconverts the waves back into sound.