KNOWLEDGE
codes and signals provide a way to send and receive messages without talking.
How is code different to a signal?
Three examples of coloured lights warning of danger are the ambulance service, fire engines and police cars.
The disadvantage of using semaphore to send a message is that you have to be able to see the flags to read them.
Ships at sea use many of these signals because if they have no other forms of communications you can see flashing lights for long distances.
The best warning for danger is personal locator beacon is for hikers or sailors. If they get lost or need help the beacons tell a satellite where they are.
There are all different signals because they do different staff.
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