… sans oublier le réseau US bien sûr
Voir http://defensetech.org/2011/12/29/china-launches-its-own-gps-satellites/

Galileo is a satellite navigation system currently being built by the European Union (EU) and European Space Agency (ESA). The €20 billion project is named after the famous Italian astronomer Galileo Galilei. One of the political aims of Galileo is to provide a high-precision positioning system upon which European nations can rely, independently from the Russian GLONASS, US GPS, and Chinese Compass systems, which can be disabled for commercial users in times of war or conflict.[1]
When in operation, it will use two ground operations centres, near Munich, Germany and in Fucino, Italy. The system was initially expected to become operational by 2012, but that date has been repeatedly moved back. As of 2011, initial service is expected around 2014 and completion by 2019.[2]
Galileo will be a free service. It is intended to provide horizontal and vertical positions measurements with metre-class precision, and better positioning services at high latitudes than GPS and GLONASS. As a further feature, Galileo will provide a global Search and Rescue (SAR) function. To do so, each satellite will be equipped with a transponder, which is able to transfer the distress signals from the user’s transmitter to the Rescue Co-ordination Centre, which will then initiate the rescue operation. At the same time, the system will provide a signal to the user, informing them that their situation has been detected and that help is on the way. This latter feature is new and is considered a major upgrade compared to the existing GPS and GLONASS navigation systems, which do not provide feedback to the user.[3] The use of basic (low-precision) Galileo services will be free and open to everyone. The high-precision capabilities will be available for paying commercial users and for military use.[citation needed]
The first satellites will bear the names of eleven-year-old Thijs from Belgium and nine-year-old Natalia from Bulgaria who are the first winners of the European Comission’s Galileo children’s drawing competition. Competition winners from the remaining 25 Member States will name the satellites which will be launched until 2019.[4] (source Wikipedia)