Selectable range ring for an ADS-B CDTI cockpit display

摘要

An electronic cockpit display of traffic information in a pilot's own aircraft, comprising: a traffic display out to a distance from the own aircraft at a periphery of the display set by an adjustable scale; and a range indicator display representing a selected physical distance from the own aircraft, the range indicator moving in a selectable range ring mode to maintain the selected distance from the own aircraft represented by the indicator as the adjustable scale changes. The range indicator display optionally may be selectively operable in an alternative half-scale range ring mode, in which the range indicator remains at the halfway position on the display as the adjustable scale changes, and in which the physical distance from the own aircraft represented by the indicator varies with the scale adjustment. Range monitoring may be provided using a range ring as the range indicator.