GUIDE is a Testing Laboratory for Geolocation.
GUIDE collects and analyzes GNSS data through live testing (aircraft, train, car, boat,...) or by generating the satellite signals within test benches.
GUIDE assesses the accuracy and integrity of your geolocation solutions based on satellites alone or with additional sensors. These services include the collection of measurements of any kind, dated and geo localized accurately
https://guide-gnss.com/