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A Russian Soyuz rocket topped with two European Galileo navigation satellites soared into orbit before dawn Tuesday, vaulting through low clouds hanging over its jungle launch base in French Guiana.

Two more Galileo satellites successfully catapulted into space from the French Guiana jungle aboard a Soyuz rocket Tuesday, putting Europe’s multibillion-dollar navigation system on track to begin limited global service later this year.

The 13th and 14th operational members of Europe’s Galileo navigation satellite network are set for liftoff Tuesday aboard a Soyuz rocket from French Guiana. Track the progress of the flight with this timeline of key events.

Europe’s nearly $8 billion Galileo navigation system, an analog to the U.S. GPS satellite network, is hitting a stride in production and launches, with another two spacecraft encapsulated Wednesday inside the fairing of a Soyuz rocket for liftoff next week.