| Answer | Crossword Clue |
|---|---|
| ALERTED | Sent smoke signals, maybe |
| ALERTED | Sent signals to |
| shoran | system for aircraft navigation in which two signals sent from an aircraft are received and answered by two fixed transponders, the round-trip times of the signals enabling the navigator to determine the aircraft's position |
| shorans | system for aircraft navigation in which two signals sent from an aircraft are received and answered by two fixed transponders, the round-trip times of the signals enabling the navigator to determine the aircraft's position |
| PUFFS | Smoke signals |
| WISPS | Smoke signals, sometimes |
| CREE | He probably used smoke signals. |
