Which action helps maintain GPS integrity during spoofing?

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!

Keyed GPS systems provide signal authenticity. When the GPS setup uses cryptographic authentication, the receiver can verify the origin of the satellite signals and reject any that fail the authentication check. This protects the navigation solution from spoofed signals by ensuring only trusted data contributes to the fix. In other words, the integrity of the GPS information is built into the system, so counterfeit signals are prevented from misleading the navigator.

Other options do not offer this proactive protection. Ignoring spoofing or continuing operations leaves the ship exposed to false position data. Disabling all sensors destroys navigational capability and multimodal sensing. Switching to manual celestial navigation can serve as a backup method, but it is not a practical or timely way to preserve GPS integrity in the face of spoofing; it also requires favorable skies and skilled celestial navigation, whereas keyed GPS provides immediate, automatic integrity checks.