The horizontal situation indicator (commonly called the HSI) is an aircraft flight instrument normally mounted below the artificial horizon in place of a conventional heading indicator.
· Well, the Horizontal Situation Indicator (HSI) is an aircraft navigation instrument that takes the heading indicator and the course deviation indicator (CDI) and combines them together.
The HSI is a flight instrument that provides a visualdisplay of the aircraft position. It combines information from the magnetic compass and a navigation instrument (VOR, ILS or GNSS).
The desired course is selected by rotating the course select knob in relation to the compass card. The HSI has a fixed aircraft symbol and the course deviation bar displays the aircraft’s position relative to the selected course.
The interpretation of the HSI (Horizontal Situation Indicator) on the ILS The HSI indicates not only the heading but also the selected localizer.
Combining the directional gyro and the NAV indicator into one instrument reduces pilot workload by providing heading, course reference, course deviation and glide slope information - all in one visual aid.
The Horizontal Situation Indicator (HSI) presents an electronically generated colour display of navigational data. Each HSI is capable of showing the airplane's progress on a dynamic map display.
