| Answer | Crossword Clue |
|---|---|
| navaids | electronic aid to navigation |
| navaid | electronic aid to navigation |
| BEAM | Airmen's aid to navigation. |
| LORAN | Aid to air navigation. |
| checkpoints | A location whose exact position can be verified visually or electronically, used by pilots to aid navigation |
| checkpoint | A location whose exact position can be verified visually or electronically, used by pilots to aid navigation |
