That same year, the concept was pursued as Project 621B, which had "many of the attributes that you now see in GPS" and promised increased accuracy for Air Force bombers as well as ICBMs.
Iste godine koncept pokrenut je Projekt 621B koji je imao "mnoge atribute koji se danas mogu vidjeti u GPS-u" i koji je obećana preciznost bombarderima ratnog zrakoplovstva te ICBM-ima.