Segundo a ESA "The first two satellites in the Galileo constellation, two experimental trail-blazers dubbed GSTB-V2/A and GSTB-V2/B, are at an advanced stage of preparation, ready to make the first step under the In-Orbit Validation phase of the Galileo programme. Both are currently in the last-tests phase before commencing their mission into orbit. The first, GSTB-V2/A, is at present undergoing its final environmental test campaign (solar simulation, acoustic and vibration checks) on the test facilities at ESA's ESTEC centre in Noordwijk (The Netherlands). The second, GSTB-V2/B, is undergoing its final integration tests at the Alenia Spazio facilities in Rome (Italy). "
Apesar do primeiro lançamento estar previsto para finais de 2005, o projecto encontra-se com revezes financeiros, em parte devido ao não pagamento da comparticipação alemã. (ver "Falta de dinheiro coloca Galileu em risco", publicado a 8/10/2005 neste blog).