Maritime Cyber / GNSS Interference Advisory
Know where a bridge is being fed a false position — and what to do about it.
GNSS interference advisory sets out where and how a vessel's position and timing are being degraded on a route — jamming, spoofing or loss of signal — and the practical precautions a bridge team can take before and during transit.
The real danger in GNSS interference is not the signal a bridge loses, but the false position it keeps trusting.
GNSS interference advisory converts a technical interference picture into the practical precautions a vessel can take — so a false position is recognised, not trusted.
The problem
The risk is not a lost signal. It is a confident, wrong one.
GNSS jamming and spoofing can degrade or falsify position, creating navigational and safety risk in affected areas.
A jammed signal is obvious. A spoofed one is not — the bridge may hold a plausible but wrong position, and time-stamped records with it.
The advisory makes that risk visible for the specific route and bridge team.
What the advisory covers
From the interference picture to the bridge.
Advisory in nature: it converts the technical picture into precautions the vessel can act on.
Interference picture
Where and how position and timing are being degraded on the route — persistent jamming, deliberate spoofing or intermittent loss.
Position & navigation impact
What degraded or false GNSS means for navigation, ECDIS and time-stamped records.
Independent cross-checks
Using RADAR, AIS behaviour and other independent sources to recognise a false position.
Bridge-team precautions
Practical precautions a bridge team can take before and during transit.
What you receive
Interference, made actionable.
Delivered as an advisory on GNSS interference and mitigating measures for the route.
Route interference advisory
Where and how interference is affecting the specific route.
Practical mitigating measures
Measures the vessel can take to protect position integrity.
Operational implications
What the interference picture means for the transit and the bridge team.
What it is not
Advisory — clearly bounded.
- Advisory on interference and its operational implications — not equipment supply or technical remediation.
- Informs navigation-integrity decisions; it does not replace the bridge team's judgement or the vessel's navigation.
GNSS advisory enquiries
Discuss GNSS exposure.
Tell us the route and the vessel. We will set out where interference is affecting the passage and what to do about it.