Big Island ARRL News, 29 July 2017, 16:00 hrs, UTC, Post #274. Source: https://www.allaboutcircuits.com/news/the-hisory-of-gps-space-era Accessed on 29 July 2017, 16:00 hrs, UTC. Author: Marie Christiano. Please click link to read the full story. Comment: An excellent account of how the International Geophysical Year (1957-1958) and the launch of Sputnik by the USSR profoundly changed our…