Editing Heading indicator (section)

{{Short description|Type of aircraft flight instrument}}
[[File:C172 heading indicator.jpg|thumb|right|A heading indicator in a [[light aircraft|small aircraft]].]]
[[File:DG interior.png|thumb|HI interior]]
{{multiple image
|image1 = Vacuum Pump system.png
|image2 =Venturi vacuum.png
|footer = Vacuum systems using a vacuum pump (left) and a venturi (right)
|total_width = 600
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The '''heading indicator''' ('''HI'''), also known as a '''directional gyro'''<ref>{{cite book |title=Grumman F11F Tiger Pilot's Flight Operating Instructions |date=1 September 2008 |publisher=United States Navy |isbn=978-1-935327-46-2 |page=51 |url=https://books.google.com/books?id=Bk_7eLUuPW4C |access-date=17 February 2022 |language=en}}</ref> ('''DG''') or '''direction indicator''' ('''DI'''),<ref>{{cite book |title=Rotorcraft Flying Handbook FAA-H-8083-21A |date=2012 |publisher=Federal Aviation Authority |page=12-3}}</ref><ref>{{cite book |last1=Kjellstrom |first1=Bjorn |last2=Elgin |first2=Carina Kjellstrom |title=Be Expert with Map and Compass |date=9 December 2009 |publisher=John Wiley & Sons |isbn=978-0-470-40765-3 |page=73 |url=https://books.google.com/books?id=xWLgCAAAQBAJ |access-date=17 February 2022 |language=en}}</ref><ref name="Bowditch" /><ref>{{cite web |title=Inside the Cockpit of Amelia Earhart's Vega |url=https://airandspace.si.edu/stories/editorial/inside-cockpit-amelia-earharts-vega |website=airandspace.si.edu |date=25 February 2019 |access-date=17 February 2022 |language=en}}</ref> is a [[flight instrument]] used in an [[aircraft]] to inform the [[aviator|pilot]] of the aircraft's [[aircraft heading|heading]].