A course deviation indicator (CDI) is an avionics instrument used in aircraft navigation to determine an aircraft's lateral position in relation to a course to or from a radio navigation beacon. If the location of the aircraft is to the left of this course, the needle deflects to the right, and vice versa.
What is CDI and OBS?
A standalone CDI (Course Deviation Indicator) is an instrument that shows your deviation from a VOR radial that is selected using the OBS (Omnibearing Selector) knob located on the instrument itself. An HSI (Horizontal Situation Indicator) is an entirely separate instrument that combines a CDI and a heading indicator.
What does the Omni Bearing Selector do?
A selector that permits an operator to select the VOR (very high frequency omnidirectional radio-range) bearing on which he or she wishes to approach or leave the station.
What is the HSI aviation?
The horizontal situation indicator (HSI) is a key instrument in IFR flight. It combines the functions of a heading indicator and navigational indicator into a single instrument. For HSI questions, first determine the aircraft heading shown at the top of the indicator. This may allow you to rule out some answers.
How does a VOR CDI work?
https://www.youtube.com/watch?v=jrQ21zKjlVg
How do you use a horizontal situation indicator?
https://www.youtube.com/watch?v=p9FHfzJFnQk
How do you use CDI in aviation?
A course deviation indicator (CDI) is an avionics instrument used in aircraft navigation to determine an aircraft's lateral position in relation to a course to or from a radio navigation beacon. If the location of the aircraft is to the left of this course, the needle deflects to the right, and vice versa.