| These chips act as transponders, always listening for a radio signal sent by transceivers, or RFID readers. |
| Four anchored dan buoys with radar transponders provided navigational control for the greater part of the survey. |
| New satellites and spacecraft would carry transponders similar to the devices carried by modern aircraft. |
| Most aircraft carry transponders, devices that relay a plane's identification, altitude and speed to ground controllers. |
| Some also have transponders which automatically change red traffic lights to green. |
| Radar is the vital part of the IFF system, interrogating unit-based transponders and reading responses. |
