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Which of the following navigational systems is most stealthy?

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Which of the following navigational systems is most stealthy?

(a) Secondary surveillance radar

(b) VOR

(c) Celestial navigation

(d) SONAR

I had been asked this question in a national level competition.

The above asked question is from Guidance and Navigation in section Introduction & Navigation Equations of Avionics

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The correct choice is (c) Celestial navigation

To explain: In celestial navigation, the position is computed by measuring the elevation and azimuth of celestial bodies relative to the navigational coordinate frame at precisely known times. Since it is a completely passive system, it is considered to be stealthy and is used in special purpose high altitude aircraft in conjunction with an inertial navigator.

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