As of May 2012, there are two global navigation systems in operation:
- Russian GLONASS and
- American GPS.
Two other global navigation systems are also being developed:
- European Galileo and
- Chinese BeiDou.
And two regional ones that provide navigation only in certain regions of the Earth:
- Japanese Michibiki (designed to complement GPS to clarify it in the Asia-Pacific region) and
- Indian IRNSS. The creators of the Indian positioning system expect to reach the Central East and Africa.
Most likely, all these systems will be included in a single global navigation system.
Research is being carried out to clarify GPS data from signals from other systems - now it is mainly GLONASS. In particular, the use of two-system receivers significantly improves the availability of the satellite signal - from 85.29% of the Earth's surface using only GPS to 99.62%.
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