The FMS uses the _____________________ as the primary navigation position reference.

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Multiple Choice

The FMS uses the _____________________ as the primary navigation position reference.

Explanation:
The FMS relies on the inertial reference system as its primary navigation position reference. The IRS uses sensors (gyros and accelerometers) to track the aircraft’s motion and continuously compute its position, velocity, and attitude without needing external signals. This self-contained method provides a stable reference even when satellite signals are unavailable or degraded. GPS, when available, typically provides external updates to improve accuracy and correct drift, but the IRS remains the foundational nav reference for the FMS. The air data computer gives speed and altitude data, not position, and a magnetic sensor provides heading information that can be influenced by local anomalies, so it isn’t used as the primary navigation position reference.

The FMS relies on the inertial reference system as its primary navigation position reference. The IRS uses sensors (gyros and accelerometers) to track the aircraft’s motion and continuously compute its position, velocity, and attitude without needing external signals. This self-contained method provides a stable reference even when satellite signals are unavailable or degraded. GPS, when available, typically provides external updates to improve accuracy and correct drift, but the IRS remains the foundational nav reference for the FMS. The air data computer gives speed and altitude data, not position, and a magnetic sensor provides heading information that can be influenced by local anomalies, so it isn’t used as the primary navigation position reference.

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