GPS-Based Monitoring System Operation
The FAA Technical Center managed GPS-Based Monitoring System (GMS) provides operators with the flexibility of conducting monitoring during regularly scheduled flights or special test flights in all geographic areas. The operational flexibility is provided by the GPS-Based Monitoring Unit (GMU). Trained specialists will set-up the GMU in a manner transparent to crew operations.
Why Monitor?
 Required by ICAO Annex 2, Annex 11 and Doc 9574
Monitoring is an effective means of verifying aircraft height-keeping performance.
GMS Monitoring Flights
Scheduled, Ferry, or Special
Straight and Level flight at FL 290-410 for approximately 30 minutes
GPS, Mode C , and Meteorological data are required for a successful monitoring flight
Monitoring Methods
Global Positioning System (GPS)-based monitoring system (GMS)
The GMS is the only available means for monitoring an aircraft that is not Mode S equipped.
The Eurocontrol ground-based Height Monitoring Units (HMUs) are located in Lintz, Austria, Nattenheim, Germany, and Genevia, Switzerland
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