How many GPS satellites are visible?

Related questions

1. What was GPS first used for?
2. How is GPS useful?
3. How does GPS affect our lives?
4. How does a GPS work for dummies?
5. What is GPS used for on a mobile phone?
6. Why was the GPS invented?
7. Does GPS work at North Pole?
8. Do I have GPS on my phone?
9. What is GPS and its use?
10. What is the use of GPS in mobile?

Tags

1. #characteristics
2. #constellation
3. #planes
4. #around
5. #needed
6. #accurately
7. #estimate
8. #device
9. #system
10. #satellite
11. #spaced
12. #mobile
13. #location
14. #global
15. #visible
16. #positioning
17. #plane
18. #equator
19. #orbit
20. #satellites
21. #operating