What does squawk mode Charlie mean?

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Tags

1. #squawk
2. #stands
3. #referred
4. #meaning
5. #there
6. #transmit
7. #anything
8. #traffic
9. #believe
10. #advisory
11. #parked
12. #transmits
13. #alpha
14. #aircraft
15. #commonly
16. #which
17. #transponder
18. #altitude
19. #position