Which element is not used in dead reckoning?

Which element is not used in dead reckoning?

• A. GPS coordinates
• B. Speed
• C. Time
• D. Direction

Answer: (A)

In dead reckoning you estimate your current position by starting from a known point and projecting your motion forward using motion data. The essential inputs are speed, time, and direction. You multiply speed by elapsed time to get distance traveled, then move that distance along your heading, adjusting for any changes in speed over time. GPS coordinates, on the other hand, are external position fixes that tell you where you are at a moment, but they aren’t part of the projection calculation itself. They’re used to verify or correct your estimate after you’ve computed it, not to compute it. So the element not used in the dead reckoning calculation is GPS coordinates.

In dead reckoning you estimate your current position by starting from a known point and projecting your motion forward using motion data. The essential inputs are speed, time, and direction. You multiply speed by elapsed time to get distance traveled, then move that distance along your heading, adjusting for any changes in speed over time. GPS coordinates, on the other hand, are external position fixes that tell you where you are at a moment, but they aren’t part of the projection calculation itself. They’re used to verify or correct your estimate after you’ve computed it, not to compute it. So the element not used in the dead reckoning calculation is GPS coordinates.