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.

The OBS (Omni Bearing Selector) knob is on the CDI, it is not its own instrument. The knob allows the selection (via the outer ring) of the radial (course) you wish to track from a VOR ground station.

Click and drag on the VOR station or airplane. As they move around, you can see the instruments display the airplane's heading and radial/course information relative to the station. The orange slider at the top can be used to control the airplane's heading.

The OBS is a selector knob on a navigational radio. It stands for the “Omni-Bearing Selector,” and it enables a pilot to select which direction they wish to fly towards or away from a VOR navigational beacon or GPS waypoint.

2024年11月19日 · Tune in and identify the VOR frequency (108.0–117.95 MHz). Set the inbound course via the Omni-Bearing Selector (OBS). Intercept the desired radial or course. Follow published descent altitudes from the approach chart. Maintain course alignment using CDI guidance. Step-by-Step Guide to Flying a VOR Approach

We can use the OBS to select the course we would like to follow or to find our direction (radial) from the station. Using the OBS VOR navigation involved flying directly to or from VOR stations along a desired radial. The OBS allows us to select the …

A VOR has three elements: an omnibearing selector (OBS), a course deviation indicator (CDI), and a TO/FROM indicator. The OBS allows you to select the line of direction that the VOR tracks. The CDI indicates how many degrees the aircraft is off that line, and in which direction.

The VOR MON will retain sufficient VORs and increase VOR service volume to ensure that pilots will have nearly continuous signal reception of a VOR when flying at 5,000 feet AGL. A key concept of the MON is to ensure that an aircraft will always be within 100 NM of an airport with an instrument approach that is not dependent on GPS.

A traditional VOR gauge, also known as a course deviation indicator (CDI) or an omni-bearing selector(OBS) The CDI linear indicator remains essentially vertical but moves left and right across the graduations on the instrument face to show deviation from being on course.