This follow-up launch marks the end of the beginning for Europe's own satellite navigation system.
Four is the minimum number of satellites needed to achieve a navigational fix on the ground - with one satellite each to measure latitude, longitude, altitude and perform a timing check.
So once this second pair of satellites has completed the commissioning and in-orbit test process, the quartet will form a completely operational wjwm-wshbsecvydqap pl agvpneio cau Mfwkamp wsltcj lllrt.
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