According to the press conference on the one-year anniversary of the global service provided by the Beidou-3 system on December 27, 2019, the Beidou system has successfully launched 53 navigation satellites so far.
        At present, there are 50 operational satellites in orbit, including 33 set as normal (healthy) satellites, 17 in orbit test satellites, and 3 retired satellites.
        By the end of this year, all 24 MEO satellites of Beidou-3 have been put into orbit, along with three IGSO satellites and one GEO satellite.
By June next year, two more GEO satellites will be launched to complete the complete networking of Beidou-3, laying the foundation for the Beidou system to provide global full services by the end of 2020.

The services provided by the Beidou system are listed in the table above  

The GPS system was originally intended to have 24 operational satellites, but currently has 35 operational satellites in orbit, including 2 GPSIIA satellites (with a maximum lifespan of 26 years).
There are 11 GPSIIR satellites, 8 GPSIIR-F satellites, 12 GPSIIF satellites, and 2 GPSIII satellites, with 30 satellites designated for healthy operation (11 GPSIIR satellites, 7 GPSIIR-F satellites, and 12 GPSIIF satellites).
The average distance measurement error of GPS satellite space signal users between November 14, 2018 and November 13, 2019 was 51.4 centimeters.

The services provided by GPS are still Standard Positioning Service (SPS) and Precision Positioning Service (PPS).
The Satellite Based Augmentation Service (SBAS) of GPS, also known as Wide Area Augmentation Service (WAAS), has three operational satellites that provide high availability services for aviation users and are prepared to offer dual frequency services.

 The GLONASS satellite constellation successfully launched another GLONASS-M satellite on December 11, 2019. At present, GLONASS has 28 operational satellites in orbit, of which 21 are designated as healthy operational satellites. Its rated constellation should be 24.
Its satellite based augmentation system SDCM has a rated operational capacity of 3 satellites, but currently only 2 are in operation.
GLONASS services are divided into four types: the first is basic open services, which only utilize the system's spatial segment signals, and now achieve positioning accuracy of better than 5 meters horizontally and 9 meters vertically, while the root mean square (95%) target accuracy is two meters. The accuracy of using satellite based differential correction is 1 meter, while the relative navigation service accuracy achieved using the national precision positioning network is 0.03 meters. By providing precise orbit and satellite based atomic clock correction, high-precision phase measurement is achieved with an accuracy of 0.1 meters.
    The Galileo system currently has 26 operational satellites in orbit, divided into two categories: one is the in orbit verification satellite, with a total of four satellites, of which three are set to work normally and one can only work with a search and rescue payload (SAR);
The other type is fully operational satellites, with a total of 22 satellites, including two that did not enter the predetermined orbit due to launch errors and became elliptical orbits, and one backup satellite, with 19 satellites set to operate normally.
A new batch of 12 satellites have been put into production and manufacturing, and the first batch of satellites is scheduled to be launched by the end of 2020.
    From 2021 to 2027, Europe will advance its single space program, integrating Copernicus Earth observation (remote sensing) with Galileo/EGNOS, as well as communication satellites.
    Galileo provides open services, commercial authentication services, high-precision services (20 centimeters), and search and rescue services.
Its spatial signal user ranging accuracy is 0.27 meters. The measurement results in June 2019 showed that the single frequency receiver achieved a positioning accuracy of 2.79 meters, while the dual frequency receiver achieved a positioning accuracy of 1.93 meters. The number of EGNOS operational satellites in orbit is 3.