This type of service requires an engineer to install a portable GPS-based monitoring unit, known as GMU or EGMU, on a targeted aircraft for a single flight. Its main advantage is the ability to monitor an individual aircraft during normal operations without the need to fly over a ground-based monitoring system in a particular portion of airspace. MAAR is currently providing this service (see HKPM Usign EGMU for more information). For other providers, please see each individual RMA website.