En Route Minimum Safe Altitude Warning
A function of the National Airspace System (NAS) Stage A en route computer that aids the controller by alerting him when a tracked aircraft is below or predicted by the computer to go below a predetermined minimum Instrument Flight Rules (IFR) altitude (MIA).
(FAA4) (FAA8)
EN ROUTE MINIMUM SAFE ALTITUDE WARNING
A function of the EAS that aids the controller by providing an alert when a tracked aircraft is below or predicted by the computer to go below a predetermined minimum IFR altitude (MIA).