9 SHAFT POSITION ENCODERS, CONVERTERS, AND AIRCRAFT INSTRUMENTS-NAMELY, DISCRETE READOUT INDICATORS, SYMBOLIC PICTORIAL INDICATORS, AND INDICATORS FOR DISPLAYING ANGULAR POSITION, AIR SPEED, GROUND SPEED, GROUND SPEED DRIFT ANGLE, TEMPERATURE, ALTITUDE, ANGULAR SHAFT SPEED, FUEL FLOW, ELEVATION ANGLE, DISTANCE, POSITION, RANGE, BEARING, COURSE DEVIATION, WIND SPEED, WIND DIRECTION, TRUE HEADING, TRACK ANGLE ERROR, DESIRED TRACK, AND CROSS TRACK DISTANCE DATA