Film
A short explanation of the coverage window, and how it differs from a Eurocontrol forecast.
Live coverage window (demo)
A public-data prototype that plots live ADS-B aircraft around the UK and colours them by reported NIC integrity.
Demonstration only. Not a certified navigation or ATC product.
What NavGuard is
NavGuard was developed by Gavin MacLennan.
Aircraft already compute GNSS integrity through RAIM and broadcast the result as Navigation Integrity Category (NIC) in ADS-B messages. NavGuard aggregates those live reports, associates them with position and time, and generates a real-time spatial coverage window of GNSS integrity across airspace.
The result is observation-based situational awareness that pure constellation-prediction tools cannot provide, including local degradations caused by interference, jamming, spoofing, or other anomalies.
How it works
- Receive ADS-B messages containing GNSS integrity indicators (NIC, and optionally NACp, SIL, SDA).
- Associate each report with aircraft position and time.
- Aggregate reports into a live spatial coverage window.
- Detect and highlight local integrity degradations.
- Deliver the map via operator display, API, or alerts.
Contact
Gavin MacLennanGlenbeg
Campbeltown
Argyll
Scotland
PA28 6QW
Status
UK patent application GB2622572.2 has been filed. This site is a public technical disclosure of the NavGuard concept.
For enquiries, collaboration, or licensing discussions, contact: