Which statement is NOT listed as a cause of GPS information unavailability?

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Prepare for the VT-IV Navigation Familiarization Exam II. Master navigation techniques with flashcards and multiple choice questions, with each answer fully explained. Boost your confidence and ace your exam!

Multiple Choice

Which statement is NOT listed as a cause of GPS information unavailability?

Explanation:
GPS information unavailability happens when there’s no usable satellite data to compute a position. That typically occurs when signals are blocked or degraded, such as mountains shadowing satellites, or when interference or jamming prevents reception, and during high dynamic maneuvers the receiver can momentarily lose lock on satellites. Ephemeris data tell the receiver where the satellites are, but an ephemeris error affects the accuracy of the position calculation rather than causing a total lack of signal data. So ephemeris error isn’t listed as a cause of unavailability.

GPS information unavailability happens when there’s no usable satellite data to compute a position. That typically occurs when signals are blocked or degraded, such as mountains shadowing satellites, or when interference or jamming prevents reception, and during high dynamic maneuvers the receiver can momentarily lose lock on satellites. Ephemeris data tell the receiver where the satellites are, but an ephemeris error affects the accuracy of the position calculation rather than causing a total lack of signal data. So ephemeris error isn’t listed as a cause of unavailability.

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