A second, nationwide observation complex was established to track the satellite after its separation from the rocket. Called the Command-Measurement Complex, it consisted of the coordination center in NII-4 and seven distant stations situated along the line of the satellite's ground track .  These tracking stations were located at Tyuratam ; Sary-Shagan ; Yeniseysk ; Klyuchi ; Yelizovo ; Makat in Guryev Oblast ; and Ishkup in Krasnoyarsk Krai .   Stations were equipped with radar , optical instruments, and communications systems. Data from stations were transmitted by telegraphs into NII-4 where ballistics specialists calculated orbital parameters. The complex became an early prototype of the Soviet Mission Control Center .