Zero False Alerts MRX boasts the unique ability to filter out any erroneous signals and only display verified transponder-equipped aircraft. Incoming signals must be completely decoded, the Mode A/C must correctly correspond to a valid altitude code, and MRX must be able to do this twice with the same aircraft. This process, among others, virtually guarantees that, if an aircraft information is being displayed, it can only be from a valid transponder-equipped aircraft. 

MRX gives you the option upon startup of operating in ground mode or flight mode. If the unit is in Ground Mode, aircraft below you and up to 200 feet above you are ignored. This is useful when on the ground and you wish to ignore the aircraft taxiing around you in favor of detecting aircraft in the pattern or on final approach. As soon as you climb (or descend) 200 feet, it will automatically switch to Flight Mode once 200 feet of climb is detected from the time you turned the unit on. Ground Mode reduces ground clutter, or the detection of aircraft at the airport with their transponders turned on. In Flight Mode, the unit will detect aircraft both above and below you.