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Medium earth orbit
Transit Spin-stabilized Transit satellites were developed by the US Navy beginning in 1958 for the first operational navigation satellite system. Transit provided continuous navigation satellite service from 1964, initially for Polaris submarines and later for civilian use. The use of the satellites for navigation was discontinued at the end of 1996 (replaced by GPS/Navstar), but the seemingly-indestructible satellites continued transmitting and became the Navy Ionospheric Monitoring System (NIMS). 46 launches, 1959.09.17 (Transit 1A) to 1988.08.25 (Transit O-31). Navigation satellite built by Naval Avionics Facility (#1-3, 5, 7); Johns Hopkins University Applied Physics Laboratory (APL) (#4, 6, 8-17); RCA (#18 - 32) for USN, USA. Launched 1964 - 1988. Used Transit-Bus, Gravity Stabilized.
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