What is squawk mode Charlie?

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Tags

1. #other
2. #number
3. #identified
4. #might
5. #instruction
6. #asked
7. #radar
8. #traffic
9. #charlie
10. #where
11. #digit
12. #ident
13. #position
14. #means
15. #squawk
16. #which
17. #transponder
18. #control
19. #settings