| Answer | Crossword Clue |
|---|---|
| transponders | A device for receiving a radio signal and automatically transmitting a different signal |
| transponder | A device for receiving a radio signal and automatically transmitting a different signal |
| racon | radar device at a fixed location that, on receiving a radar signal, automatically transmits a particular radar signal in reply, identifying itself and enabling navigators of ships and aircraft to determine their distance and direction from it |
| racons | radar device at a fixed location that, on receiving a radar signal, automatically transmits a particular radar signal in reply, identifying itself and enabling navigators of ships and aircraft to determine their distance and direction from it |
