Title: Satellite navigation - Wikipedia
Headings: Satellite navigation
Satellite navigation
Contents
Classification
History and theory
Applications
Global navigation satellite systems
GPS
GLONASS
BeiDou
Galileo
Regional navigation satellite systems
NavIC
QZSS
Comparison of systems
Augmentation
Related techniques
DORIS
LEO satellites
See also
Notes
References
Further reading
External links
Information on specific GNSS systems
Organizations related to GNSS
Supportive or illustrative sites

Content: Satellite navigation - Wikipedia
Satellite navigation
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"GNSS" redirects here. For the irrigation project in Andhra Pradesh, see Galeru Nagari Sujala Sravanthi Project. Use of satellite signals for geo-spatial positioning
The U.S. Space Force 's Global Positioning System was the first global satellite navigation system and was the first to be provided as a free global service. Part of a series on
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A satellite navigation or satnav system is a system that uses satellites to provide autonomous geo-spatial positioning. It allows small electronic receivers to determine their location ( longitude, latitude, and altitude / elevation) to high precision (within a few centimeters to metres) using time signals transmitted along a line of sight by radio from satellites. The system can be used for providing position, navigation or for tracking the position of something fitted with a receiver (satellite tracking). The signals also allow the electronic receiver to calculate the current local time to high precision, which allows time synchronisation. These uses are collectively known as Positioning, Navigation and Timing ( PNT ). Satnav systems operate independently of any telephonic or internet reception, though these technologies can enhance the usefulness of the positioning information generated. A satellite navigation system with global coverage may be termed a global navigation satellite system ( GNSS ).