00:00Modern navigation delivers a level of precision that earlier generations could not have imagined,
00:04with position, course, and speed continuously available and seamlessly integrated across every system on the bridge.
00:12Over time, this reliability has shaped behavior.
00:15Position is no longer something that is actively verified.
00:18It is something that is understood to be correct.
00:21On a contemporary bridge, GNSS has become the reference against which all other inputs are aligned.
00:27ECTIS, AIS, and track control systems build a coherent picture around it,
00:32creating an environment where consistency is taken as confirmation.
00:36The challenge emerges when that reference itself is compromised,
00:40because the system continues to present a stable and believable picture even as it diverges from physical reality.
00:46Interference today is not limited to signal loss.
00:49It increasingly takes the form of controlled manipulation,
00:52where position can shift gradually without triggering alarms,
00:56remaining within limits that appear operationally acceptable.
00:59This brings navigation to a different requirement.
01:02Accuracy remains important, but credibility becomes essential.
01:07Inertial navigation provides an independent reference based on the vessel's own motion,
01:11allowing the bridge to retain continuity,
01:13and, more importantly, to recognize when external inputs no longer align with reality.
01:19Conclusion
01:21degrade
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