ILS… some just have the vertical needle referred to as the CDI needle). Of them have the cross hairs that will also show you vertical guidance for an The reason the CDI can be a little confusing is because itĬan either be its own standalone instrument (used for VOR navigation) or it canīe a component within an HSI (Horizontal Situation Indicator).īelow is a picture of a CDI used for VOR navigation (not all CDI (Course Deviation Indicator) Explained When part ofĪn HSI, the CDI is more just the actual course deviation needle on the instrument rather than the entire instrument itself.īelow we’ll incorporate some pictures to hopefully clear A CDI can be its own standalone instrument used for VOR navigation, or itĬan be part of an HSI which also integrates a heading indicator. Is that we refer to an HSI and CDI as the same thing when in reality they are I think part of the reason these terms get a bit confusing Whereas a traditional CDI will only show your deviation to a given VOR radial,Īn HSI will show both your present heading and lateral position in relation toĪ VOR radial or GPS course line and doesn’t have the potential for reverse An HSI (Horizontal Situation Indicator) is anĮntirely separate instrument that combines a CDI and a heading indicator. VOR radial that is selected using the OBS (Omnibearing Selector) knob located (Course Deviation Indicator) is an instrument that shows your deviation from a So it’s a very common question: what’s the difference between an HSI (Horizontal Situation Indicator), CDI (Course Deviation Indicator), OBS (Omnibearing Selector), and Heading Selector? Not to mention there are two different input knobs on it (versus a VOR with just one). The HSI can admittedly be confusing at first because there is a lot of information packed into that one instrument. I did not know how much I loved and needed one of these instruments until I bought an airplane that had one, and I will never go back. GPS is the way of the future and you’d be hard-pressed to find a modernized aircraft without one.īut one instrument in particular has been effective, adaptable, and extremely effective both through the VOR era (which isn’t over yet) and into the GPS era, and that is the HSI or Horizontal Situation Indicator. Other than that it was true IFR – “I Follow Roads.” As technology has greatly improved over the past decades, ADFs have been all but phased out, and even VORs are on the beginning of the end of their time here. In navigation days of old, a pilot was lucky to have an ADF or possibly a VOR to get around.
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