| Answer | Crossword Clue |
|---|---|
| beam | not on the course indicated by a radio beam |
| beam | on the course indicated by a radio beam, as an airplane |
| ride | to fly along the course indicated by a radio beam |
| sins | gyroscopic device indicating the exact speed and position of a vessel, as indicated by differences in positions over a given period on a given course, as well as the direction of true north |
