The global positioning system (gps) is a u. s.-owned utility that provides users with positioning, navigation, and timing services. the u. s. air force develops, maintains, and operates the space and control segments. the space segment consists of a "constellation" of 24 operating satellites that send one-way signals that give the current gps satellite position and time. gps satellites fly in medium earth orbit at an altitude of approximately 12,550 miles. each satellite circles the earth twice a day. the satellites in the gps constellation are arranged into six equally-spaced orbital planes surrounding the earth. each plane contains four "slots" occupied by baseline satellites. this 24-slot arrangement ensures users can view at least four satellites from virtually any point on the planet. worldwide monitor and control stations make up the control segment. these maintain the satellites in their proper orbits and adjust the satellite clocks. the segment tracks the gps satellites and uploads navigational data. the current operational control segment includes a master control station, an alternate master control station, 11 command and control antennas, and 15 monitoring sites. the user segment is made up of the gps receiver equipment. the equipment receives the signals from the gps satellites and uses the information to calculate the user's position and time. like the internet, gps is an essential element of the global information system. the free, open, and dependable nature of gps has led to the development of hundreds of applications affecting every aspect of modern life. gps satellites provide service to civilian and military users. the civilian service is freely available to all users on a continuous, worldwide basis. the military service is available to u. s. and allied armed forces as well as approved governmentagencie how does the context of paragraph 5 the reader determine the meaning of the word civilian? a. defining civilian and military users the reader determine that a civilian is someone who works on gps satellites. b. restating the role of civilian agencies the reader determine that a civilian is someone who joins the armed forces. c. providing an example of civilian service the reader determine that a civilian is someone who works for the government. d. contrasting civilian and military users the reader determine that a civilian is someone who is a private citizen. s.