How often are GPS and INS predictions compared?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

How often are GPS and INS predictions compared?

In GPS/INS integrated navigation, the INS continuously predicts your motion between GPS fixes, while the GPS provides periodic updates. To keep the fused solution reliable and to catch sensor faults early, the system checks how well the INS predictions align with the GPS measurements on a fixed cadence. The standard cadence used is every 8 seconds. This interval is a practical balance: it’s frequent enough to catch growing errors and drive timely corrections, yet not so frequent that it overworks processing or becomes overly sensitive to GPS noise. Between checks, the INS continues to propagate the state, and the GPS update, when available, is used to correct and recalibrate the prediction.

In GPS/INS integrated navigation, the INS continuously predicts your motion between GPS fixes, while the GPS provides periodic updates. To keep the fused solution reliable and to catch sensor faults early, the system checks how well the INS predictions align with the GPS measurements on a fixed cadence. The standard cadence used is every 8 seconds. This interval is a practical balance: it’s frequent enough to catch growing errors and drive timely corrections, yet not so frequent that it overworks processing or becomes overly sensitive to GPS noise. Between checks, the INS continues to propagate the state, and the GPS update, when available, is used to correct and recalibrate the prediction.

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