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Which one of the following is false with respect to TRN?

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Which one of the following is false with respect to TRN?

(a) self contained

(b) Unjammable

(c) Low accuracy

(d) No external systems needed

I got this question in an interview for job.

The origin of the question is Modular Avionics Architectures & UAV Avionics topic in division Avionics System Integration of Avionics

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The correct option is (c) Low accuracy

The explanation is: Terrain reference navigation, TRN, systems are used in cruise missiles and aircraft. One of the major advantage in UAV/UCAV applications is that they are completely self-contained and unjammable as well as of high accuracy. They are completely independent of any external systems such as satellites or ground stations.

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