Selectable range ring for an ADS-B CDTI cockpit display

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;
• a range indicator display representing a selected physical distance from the own aircraft, the range indicator moving in a fixed distance mode to maintain the selected distance from the own aircraft represented by the indicator as the adjustable scale changes.

An electronic display of information relative to an object, comprising:

• a display of a condition out to a distance from the object at a periphery of the display set by an adjustable scale;
• a range indicator display representing a selected physical distance from the object, the range indicator moving in a fixed distance mode to maintain the selected distance from the object represented by the indicator as the adjustable scale changes.

In a method of displaying traffic information on an electronic display relative to an own aircraft,

• providing a range indicator on the display representing a selected physical distance from the own aircraft;
• and
• moving the range indicator in a fixed distance mode to maintain the selected distance represented by the indicator while changing the scale of physical distance represented on the display.