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Long-range navigation system (LRNS). An electronic navigation unit that is approved for use under instrument flight rules as a primary – 14 CFR 1.1

Long-range navigation system (LRNS). An electronic navigation unit that is approved for use under instrument flight rules as a primary means of navigation, and has at least one source of navigational input, such as inertial navigation system, global positioning system, Omega/very low frequency, or Loran C.

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