| Clue | Answer |
|---|---|
|
|
|
| Communication by flags (9) | |
| Old communications system (9) | |
| Messaging by flags (9) | |
| Communication means at sea (9) | |
| Signalling equipment (9) | |
There are 2 solutions. The longest is SEMAPHORE with 9 letters, and the shortest is BUZZER with 6 letters.
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Solutions are between 6 and 9 letters long.