Extrait :
"The Declaration of Galileo Initial Services means that the Galileo satellites and ground infrastructure are now operationally ready. During the initial phase, the first Galileo signals will be used in combination with other satellite navigation systems, such as GPS. In the coming years, new satellites will be launched to enlarge the Galileo constellation, which will gradually improve Galileo availability worldwide. The constellation is expected to be completed by 2020 when Galileo will reach full operational capacity."