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.

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. If the location of the aircraft is to the left of course, the needle deflects to the right, and vice versa.

OBS vs CDI. Both of these components are found on a navigation radio, and they are connected to one another. The OBS (Omni-Bearing Selector) is the knob that the pilot adjusts. On the other hand, the CDI (Course Deviation Indicator) is the needle …

A course deviation indicator (CDI) [1] 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 …

2020年7月1日 · The panel’s navigator head includes the OBS (omni-bearing selector) and CDI (course deviation indicator). Learning to use a CDI with a VOR also will apply to GPS navigation in an airplane with a panel-mounted GPS. The CDI acts somewhat like a course line, showing the pilot the relationship of the airplane to the selected course.

2015年12月23日 · The instrument that displays all of this information is most commonly called the Course Deviation Indicator, or CDI. The Omni-Bearing Selector (OBS) knob lets you select one of these spokes (radials), and the CDI will tell you where you are in relation to your selected radial.

航向偏差指示器（Course Deviation Indicator，缩写为CDI）是用于 飞机 导航的航空电子仪器，用于确定飞机相对于航线的横向位置。 如果飞机的位置在左边航道，则航道偏差指示器针头向右偏转，反之亦然。

2020年9月17日 · The CDI is a Course Deviation Indicator. It does not display heading information. The OBS knob is the Omni Bearing Selector. I'm too tired to explain to you how this thing works. It's basic knowledge, look it up on Wikipedia or something.

航向偏差指示器（Course Deviation Indicator，缩写为CDI）是用于飞机导航的航空电子仪器，用于确定飞机相对于航线的横向位置。 如果飞机的位置在左边航道，则航道偏差指示器针头向右偏转，反之亦然。

2022年2月10日 · The first instrument is the Course Deviation Indicator (CDI), and the second is the Omnibearing Selector (OBS). Both located within the cockpit, a CDI and OBS provide aircrew with critical data during flight.