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United States Air Force
Thor DM-21 Ablestar | Transit 1B
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Mission brief
The flight at a glance.
The Transit system was the first satellite navigation system to be used operationally. The system was primarily used by the U.S. Navy to provide accurate location information to its Polaris ballistic missile submarines, and it was also used as a navigation system by the Navy's surface ships, as well as for hydrographic survey and geodetic surveying.
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Planned timings relative to the target. These steps do not indicate live progress.
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