| Answer | Crossword Clue |
|---|---|
| LORAN | Navigation device |
| RADAR | Navigation device. |
| GYROCOMPASS | Navigation device |
| SONAR | Navigation device |
| SONAR | Navigation device. |
| LORAN | Navigation device. |
| GPS | Navigation device, briefly |
| LORAN | Device used in navigation. |
| RADAR | Navigation device used since the 1930's. |
| DIRECTIONFINDER | Device useful in navigation, or in discovering the hidden theme in the answers to starred clues |
