The centres coordinate their activities closely with the ICG executive secretariat and GNSS providers , which provide support for the development of GNSS services and applications in the regions . At the African Regional Centre for Space Science and Technology Education - in French language ( CRASTE-LF ) , located in Rabat , and the African Regional Centre for Space Science and Technology Education - in English language ( ARCSSTE-E ) , located in Ile-Ife , Nigeria , the first session of a nine-month post-graduate course on GNSS was completed in September 2014 .