"Most articles about the US information superhighway have concentrated on the need for better physical security, while at the same time identifying many of its cyber-related vulnerabilities. Few address what possibly is the most vulnerable element--the human operators--and the inability of those operators from the policy level down to practice good operations security (OPSEC). In a 4 June 1998 Guardian Online article by Duncan Campbell, entitled 'Hiding from the Spies in the Skies,' he states, 'The Internet has made tracking and evading spy satellites child's play.... Data and programs downloaded from the Net enable anyone to track the satellites and work out when the spies in the sky are overhead.' Campbell also provides instructions on how to visually acquire satellites with the naked eye and even lists six Internet Uniform Resource Locator addresses where one can find programs and information on the location of the 'spies in the skies.' He refers to several Internet sites in his article that offer the capabilities to track the locations, routes, and times certain satellites will pass over specific locations."
Center for the Study of Intelligence: https://www.cia.gov/library/center-for-the-study-of-intelligence/index.html
Studies in Intelligence (Summer 2000), no.9