Editing Heading indicator (section)

== Use ==
The primary means of establishing the [[Course (navigation)#Determining the true course of a vessel|heading]] in most small aircraft is the magnetic [[compass]], which, however, suffers from several types of errors, including that created by the "dip" or downward slope of the Earth's magnetic field.  Dip error causes the magnetic compass to read incorrectly whenever the aircraft is in a bank, or during acceleration or deceleration, making it difficult to use in any flight condition other than unaccelerated, perfectly straight and level.  To remedy this, the pilot will typically maneuver the airplane with reference to the heading indicator, as the gyroscopic heading indicator is unaffected by dip and acceleration errors. The pilot will periodically reset the heading indicator to the heading shown on the magnetic compass.<ref name="Bowditch">Bowditch, Nathaniel. [https://books.google.com/books?id=M54M8qjxLQMC&pg=PA93 American Practical Navigator], Paradise Cay Publications, 2002, pp.93-94, {{ISBN|978-0-939837-54-0}}.</ref><ref name="NASA">NASA [http://asrs.arc.nasa.gov/publications/callback/cb_304.htm NASA Callback: Heading for Trouble], NASA Callback Safety Bulletin website, December 2005, No. 305. Retrieved August 29, 2010.</ref><ref name="FAA2">{{cite book |title=Instrument Flying Handbook, FAA-H-8083-15B |date=2012 |publisher=U.S. Dept. of Transportation, FAA |page=5-19,5-20 |url=https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/media/FAA-H-8083-15B.pdf}}</ref><ref name="FAA1">{{Cite PHAK|year=2016|chapter=8|pages=19-20}}</ref>