Are ICAO standards mandatory?

Related questions

1. How much does the temperature drop for every 1000 feet of elevation?
2. What is difference between Metar and TAF?
3. What is ISA standard temperature?
4. What does RAB mean in a Metar?
5. What is touchdown zone elevation?
6. What is AFA?
7. What is corrected barometric pressure?
8. What does Isa 15 mean?
9. What is a convective Sigmet?
10. How long is TAF valid?

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1. #convention
2. #advance
3. #adopted
4. #states
5. #international
6. #bodies
7. #requested
8. #recommendation
9. #aviation
10. #standards
11. #chicago
12. #required
13. #comply
14. #articles
15. #under
16. #there
17. #decision
18. #through
19. #civil
20. #relevant
21. #various
22. #which
23. #their
24. #urged
25. #cases