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20,200 kms above the earth
11 hour 58 min orbits
If passing overhead, each satellite is in view 4 - 6 hours
Same constellation visible each day to an observer 4 minutes earlier.
Earlier 4 min/day, 2hr/month, 24 hr/year.
Status at the beginning of July 1996 - 25 satellites were in use.
7.5 year design
7 year average life for Block 1 satellites.
military safe
10-20 m accurate navigation position
Common coordinate system, now an integral part of Civil Use for all
major Survey and Navigational Applications.
Availability of wide ranging GPS Receivers for various applications.
Accuracy available up to mm level.
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Special Volume 1, October 2015
36