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 GPS Based Monitoring System
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 install the GMU in a manner transparent to crew operations.
Why Monitor?
 Required by ICAO Doc 9574
Monitoring is an effective means of verifying aircraft height-keeping performance.
GMS Monitoring Flights
Scheduled, Ferry, or Special
Straight and Level while flying FL 290-410 for 30 minutes
GPS, Mode C Data, and Met Data should be available for successful monitoring
Monitoring Methods
Global Positioning System (GPS)-based system (GMS)
The GMS is the only available means for monitoring aircraft in the Pacific Region.
Ground based height monitoring units (HMUs) located at Strumble, Wales and
Gander, Newfoundland
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