Before revision: Global navigation satellite systems (GNSS) Nowadays, several hundred geodetic satellites are in orbit, supplemented by a large number of remote sensing satellites and navigation systems like GPS and Glonass, which will be followed by the European Galileo satellites in 2020.
After revision: Global navigation satellite systems (GNSS) Nowadays, several hundred geospatial satellites are in orbit, including a large number of remote sensing satellites and navigation systems like GPS and Glonass, which was followed by the European Galileo satellites in