What is the difference between CDI and HSI?

What is the difference between CDI and HSI?

Whereas a traditional CDI will only show your deviation to a given VOR radial, an HSI will show both your present heading and lateral position in relation to a VOR radial or GPS course line and doesn’t have the potential for reverse sensing.

Does HSI reverse sensing?

Reverse sensing occurs when the current heading is on the bottom half of the VOR. Taking this theory to the HSI where the currently flown heading is always on the top half and you can never have reverse sensing. It is also proper technique to set in the front course when flying a LOC/BC approach.

What is the function of HSI?

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. It shows the heading, course, bearings and the lateral deviation of an aircraft.

What makes an HSI easier?

In addition, an HSI makes it easier to visualize the aircraft’s position with reference to the selected course or holding patterns. The “split needle” presentation made up of the course and reciprocal pointers and the VOR/LOC deviation indicators, clearly shows both selected course and course deviation.

What information can the HSI provide?

Horizontal Situation Indicator (HSI) The HSI provides a basic horizontal view of the aircraft’s navigation picture. In the F-15E, it can provide navigation data to selected ground navigation facilities (TACAN or Instrument Landing System (ILS)) or to onboard navigation systems like the Inertial Navigation System (INS).

Does an HSI precess?

If equipped with a slaving feature, an HSI will automatically “update” its compass card with the magnetic compass to correct for precession. The meter needle will oscillate slowly when the compass card is properly aligned with the magnetic compass.

Does an HSI have reverse sensing?

The HSI combines a heading indicator with CDI needles. As long as you tune the front course for the localizer, you won’t get reverse sensing.

What is OBS in a plane?

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.