In June 2017, multiple vessels operating in the Black Sea suddenly began reporting impossible GPS positions.
Ships that were physically at sea appeared inland at Gelendzhik Airport in Russia instead. Some reports suggested more than 20 vessels were affected simultaneously.
The incident became one of the most widely discussed examples of maritime GPS spoofing ever recorded.
But what made the event particularly dangerous was this:
Many navigation systems still appeared healthy.
Vessels continued receiving:
- valid GPS positions
- satellite lock
- apparently stable navigation data
while the actual position information had become false.
The Real Problem
The biggest danger with modern GNSS anomalies is not always total failure.
Sometimes the danger is when navigation systems continue appearing normal while the underlying navigation data becomes unreliable.
This creates a serious operational problem:
crews may continue trusting navigation information that no longer reflects physical reality.
Why GeoWatch Matters
GeoWatch was designed around a different question from traditional navigation systems:
"Does the vessel movement still make physical sense?"
Rather than replacing GNSS or AIS, GeoWatch continuously compares vessel motion behavior against navigation data to identify anomalies such as:
- impossible movement
- frozen positions
- unrealistic heading changes
- circular drift
- spoofing indicators
The goal is not to improve positioning accuracy.
The goal is to identify situations where navigation trust itself may already be compromised.
Accuracy vs Integrity
Modern correction services improve navigation precision.
GeoWatch focuses on independently verifying navigation integrity.
A simple analogy is:
One system improves the compass.
The other checks whether the compass is lying.
As vessels become increasingly dependent on digital navigation systems, independently verifying navigation trust may become just as important as navigation accuracy itself.