Across
- 3. a pyrotechnic visual signal communication device used to transmit short commands, alerts, and also transmit call signals.
- 5. a signal or message that a ship or plane sends when it needs help immediately
- 7. a system used for sending messages, in which letters and numbers are represented by short and long marks, sounds, or flashes of light
- 10. a small radio held in the hand, used for both sending and receiving messages
Down
- 1. a small metal or plastic tube that you blow to make a loud, high sound, used to attract attention or as a signal
- 2. an act of bringing an aircraft or a spacecraft down to the ground after a journey
- 4. an international radio signal used by ships and aircraft needing help when they are in danger
- 6. signal a signal that is sent to somebody who is far away, using smoke
- 8. an instrument for finding direction, with a needle that always points to the north
- 9. a drug or another form of medicine that you take to prevent or to treat an illness