What is the dial for on a divers watch?

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Tags

1. #marker
2. #clock
3. #function
4. #aligned
5. #watches
6. #elapsed
7. #which
8. #prominent
9. #actually
10. #before
11. #minutes
12. #bezel
13. #descent
14. #allowing
15. #particularly
16. #simple
17. #diver
18. #quite
19. #minute