| Answer | Crossword Clue |
|---|---|
| AMAIN | At great speed, at sea |
| AMAIN | At full speed, at sea |
| KNOT | Speed unit at sea |
| KNOTS | Speed units at sea |
| KNOT | Unit of speed at sea |
| AMAIN | Full speed ahead, at sea |
| AMAIN | At full speed, on the sea |
| subsonic | noting or pertaining to a speed less than that of sound in air at the same height above sea level |
