The Sky's The Limit - <<Heading indicator>> <<Direction Indicator>> <<Flight Instruments 101>> <<Basic 6 Pack #5 H.I / D.I>> The heading indicator is a flight instrument used in an aircraft to inform
direction / heading indicator
RC Allen RCA11A-15 Vacuum Directional Gyro (Cardinal Display, Piper/Cessna)
Flight Instruments: The Heading Indicator and Magnetic Compass – Learn to Fly Blog - ASA (Aviation Supplies & Academics, Inc.)