A system for highlighting a parameter image representative of a flight parameter of an aircraft, the system comprising: an aircraft computer; a graphics rendering controller coupled to the aircraft computer and configured to generate the parameter image; and an electronic instrument display coupled to the graphics rendering controller to present the parameter image; wherein: the parameter image is a graphically-depicted scale comprising: an index marker configured to indicate a target value of the flight parameter, and a pointing arm configured to indicate an actual value of the flight parameter; and at least one of the graphics rendering controller or the aircraft computer is configured to monitor the flight parameter for variations in the parameter value; characterized in that: the graphics rendering controller is configured to magnify a circular area of the parameter image that encompasses the index marker and a tip of the pointing arm in response to the actual parameter value coming within a predetermined range from the target value; and the graphics rendering controller is configured to terminate the magnification of the circular area of the parameter image when the actual parameter value lies outside the predetermined range from the target value. an aircraft computer; a graphics rendering controller coupled to the aircraft computer and configured to generate the parameter image; and an electronic instrument display coupled to the graphics rendering controller to present the parameter image; wherein: the parameter image is a graphically-depicted scale comprising: an index marker configured to indicate a target value of the flight parameter, and a pointing arm configured to indicate an actual value of the flight parameter; and at least one of the graphics rendering controller or the aircraft computer is configured to monitor the flight parameter for variations in the parameter value; the parameter image is a graphically-depicted scale comprising: an index marker configured to indicate a target value of the flight parameter, and a pointing arm configured to indicate an actual value of the flight parameter; and an index marker configured to indicate a target value of the flight parameter, and a pointing arm configured to indicate an actual value of the flight parameter; and at least one of the graphics rendering controller or the aircraft computer is configured to monitor the flight parameter for variations in the parameter value; characterized in that: the graphics rendering controller is configured to magnify a circular area of the parameter image that encompasses the index marker and a tip of the pointing arm in response to the actual parameter value coming within a predetermined range from the target value; and the graphics rendering controller is configured to terminate the magnification of the circular area of the parameter image when the actual parameter value lies outside the predetermined range from the target value. the graphics rendering controller is configured to magnify a circular area of the parameter image that encompasses the index marker and a tip of the pointing arm in response to the actual parameter value coming within a predetermined range from the target value; and the graphics rendering controller is configured to terminate the magnification of the circular area of the parameter image when the actual parameter value lies outside the predetermined range from the target value.