Field notes
Vessel IT, ship-shore operations, and navigation trust—from people working with these problems every day.
A recent field report on long-lasting GNSS almanac poisoning shows why navigation trust is not only about detecting live jamming or spoofing. Sometimes the receiver can remain impaired after the interference is gone.
Read articleIf GNSS almanac poisoning leaves a receiver impaired for two or three days, the problem is not only navigation. The VDR may preserve a complete record of data that was never trustworthy.
Read articleA recent Digital Ship article on GPS spoofing makes the same point GeoWatch was built around: maritime digitalisation depends on navigation data that may look valid even when trust has started to fail.
Read articleThe 2021 Orange County oil spill shows why maritime evidence preservation matters when investigators need to reconstruct vessel movement long after the original navigation event.
Read articleA high satellite count can make a GNSS solution look healthy, but speed, course, status fields, and motion context may tell a very different story.
Read articleA vessel approaching port showed healthy-looking GNSS numbers, but the raw RMC stream carried a warning while the reported position froze in place.
Read articleA port-approach case showed a smooth, believable GNSS track with strong satellite fields, while receiver warnings and onboard motion data said the position should still be verified.
Read articleAn offshore monitoring trial showed a GNSS track moving in discrete steps with zero-speed holds while onboard motion data stayed quiet and healthy.
Read articleIf the vessel is still but GPS says it moved, correction systems and INS may not catch the lie. Physical motion integrity can.
Read articleA monitoring-only offshore trial showed a smooth, valid-looking GNSS track with strong satellite and DOP fields, while onboard motion data told a different story.
Read articleThe 2017 Black Sea GPS spoofing incident showed how vessels can continue receiving apparently valid navigation data while their reported positions become physically impossible.
Read articleNavigation systems can continue showing valid fixes, healthy satellite lock, and stable status while the underlying vessel movement no longer makes physical sense.
Read articleA monitoring-only offshore trial showed a subtle GNSS integrity pattern: a frozen fix, a position jump, and a smooth reported track that did not match onboard motion.
Read articleGNSS disruption, spoofing, AIS inconsistencies, and unexplained drift are operationally dangerous because the bridge picture can still look valid after trust has started to fail.
Read articleGNSS trust loss is dangerous because it often arrives as a plausible picture, not an obvious failure.
Read articleResilient inertial navigation helps vessels keep moving when GPS is degraded. GeoWatch adds the independent trust layer crews need around that resilience.
Read articleANELLO's Maritime INS case study shows why GPS-denied navigation is becoming practical. GeoWatch explains why crews still need clear trust cues on the bridge.
Read articleSpoofed or degraded GNSS is dangerous not only because it becomes wrong, but because it can stay convincing while it is wrong.
Read articleGood bridge support starts before total failure, when smaller signs show the position source is becoming less trustworthy.
Read articleA usable incident record is easiest to protect while the event is still happening, not after teams start rebuilding it from fragments.
Read articleWhen GNSS trust drops, crews need practical support inside the workflow, not a separate tool they have to remember under pressure.
Read articleWhen the navigation picture starts to go wrong, operators benefit more from clear trust cues than from another screen full of metrics.
Read articleOnce a GNSS event is over, rebuilding it from memory and fragments usually produces a weaker record than teams expect.
Read articleOne of the most dangerous GNSS anomalies is not a chaotic failure, but a clean-looking route that has quietly shifted into the wrong corridor.
Read articleA sudden location jump is not just a display oddity. It is a high-value warning that the reported position may no longer be physically believable.
Read articleA frozen or delayed GPS feed can be dangerous precisely because it still looks present, creating the illusion of certainty after the position has stopped updating properly.
Read articleWhen GPS-derived motion and inertial motion evidence stop agreeing, the disagreement itself becomes a valuable trust signal.
Read articleWhen a stationary vessel begins tracing a smooth loop on the display, the problem is not motion. It is trust.
Read articleWhen a live fix is lost but the vessel track continues in a clean estimated line, the visual continuity can create more confidence than the situation deserves.
Read articleWhen a vessel should be holding station but the reported fixes start leaking beyond the expected box, the early pattern matters.
Read articleWhen a live track exits an established operating corridor, the breach is not only a routing issue. It can also be a navigation-trust signal.
Read articleGeoWatch is the independent physics‑based layer that monitors all motion sources and flags inconsistencies in real time.
Read articleAutonomy and digital navigation need independent verification layers.
Read articleThe Strait of Hormuz has become one of the world’s most active GNSS interference zones.
Read articleSafe operations now depend on being prepared for the moments when digital systems fail.
Read articleThe Digital Ship analysis shows how Hormuz has evolved into an environment where GNSS spoofing, AIS manipulation, and electronic deception are now routine.
Read article