How accurate are GPS units?

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Tags

1. #states
2. #united
3. #accuracy
4. #better
5. #locations
6. #civilian
7. #interval
8. #vertical
9. #worse
10. #confidence
11. #devices
12. #claims
13. #horizontal
14. #government
15. #meter
16. #reliably
17. #currently
18. #minimum