Why Ships Need INS When GNSS Fails

The DeepDraft

This is the real risk of GNSS spoofing.  AIS, ECDIS, and radar overlays can all align around a false reference. There is no alarm for misplaced confidence.  Inertial Navigation Systems (INS) provide an independent position reference, allowing detection of compromised signals and maintaining continuity when GNSS cannot be trusted.  This is no longer about accuracy. It is about credibility of position.  DeepDraft Analysis by a serving Master Mariner Maritime navigation | GNSS interfere

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00:00Modern navigation delivers a level of precision that appears stable, consistent, and reliable across every system on the bridge.

00:09Position, course, and speed are continuously available, and everything aligns to create a coherent picture of reality.

00:17But that consistency can hide a deeper problem.

00:21When GNSS is manipulated, the system does not fail.

00:25It continues to operate normally, presenting a position that looks correct, while gradually drifting away from the vessel's actual location.

00:34This kind of interference does not trigger alarms.

00:37It develops within operational limits, allowing the vessel to follow a track that appears valid until the margin for correction

00:45is reduced.

00:46Inertial navigation provides an independent reference based on the vessel's own motion, allowing the bridge to maintain continuity and recognize

00:56when external inputs no longer align with reality.

01:00The issue is no longer position accuracy.

01:04It is position credibility.

01:05It is position credibility.

01:06It is position credibility.

01:09It is position miejscuose.

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