With a Horizontal Situation Indicator (HSI) it is not the scale that rotates when we tune the Omni Bearing Selector (OBS), it is the VOR arrow itself. The scale is moving automatically with the compass, it always shows our heading, making the HSI a 2 in 1 instrument, heading- and VOR indicator, thus reducing eye movement for instrument scanning.
How to intercept a VOR radial usung the HSI, or the Garmin1000, or the Primary Flight Display of a plane?
Scroll down to watch the video. Click the images to enlarge.
To fly straight to or from a VOR, turn the OBS until the needle shows as a straight line. The heading to fly can now be read out from the scale. Take notice of the ‘to / from indicator arrow.
To intercept a specific radial, turn the OBS such that the VOR indicator arrow point to that radial, in this example the 30 radial. Now look where the middle of the needle is and count 45 degrees in that direction to find the heading to fly. We’ll now be on a 45 degrees intercept heading.
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Yes, this 75 heading gives us a perfect 45 intercept angle.
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Another example. Again we want to intercept the 30 radial of the VOR. We rotate the OBS until the needle points at 30. We note where the middle of the needle is and we count 45 degrees in that direction, this time leading to a 345 heading.
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Yes, this looks like the perfect intercept angle.
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The video shows the use of the Garmin 1000 HSI to intercept the 0/360 radial of the BRUNO VOR during a flight over Belgium.
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