The TRANSIT system was the first operational satellite navigation system, and the first operational satellite system in general. The system contained, usually, ten working satellites (five for the basic constellation and five spares) in a low polar orbit, with an eventual 27 satellites total. The Navy used it for precise location of their ships and submarines; it was basically a primitive version of GPS, in function and method.

Spectrogram credit: Maik Hermenau.
Spectrogram credit: Maik Hermenau.

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