DME is an abbreviation for Distant Measuring Equipment and identifies a particular type of equipment that is used to measure the line of sight of distant. The DME-42 transceiver is remote mounted light weight and fully solid state, unit specifically designed for general aviation aircraft. DME-42 measure the slant range distant from the aircraft to a ground station and display the distant in nautical miles. DME-42 is a 3 channel unit designed for new installation or for retrofitting. Serial data tuning for tuning with Long Range Navigation Systems with a 300 watts power output. The DME-42 tuning information is equivalent of two CTL-32 controls.