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2 Answers

HSI on a G1000

Asked by: 22535 views Aircraft Systems, Flight Instructor, Instrument Rating

When using a VOR or ILS in a G1000 equiped airplane, how many degrees does each dot on the HSI scale represent?

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2 Answers



  1. John D. Collins on Jul 31, 2013

    On the G1000 implementation I am familiar with, there are two dots on either side of the course center. A VOR full scale deflection is 10 degrees, so each dot is 5 degrees. The localizer antenna array is located off the departure end of the runway for an ILS. For an ILS, the course width varies between 3 degrees and 6 degrees, depending on the length of the runway because the width of the ILS course is set at the threshold to be a fixed 700 feet. At 3 degrees the full scale deflection is +/- 1.5 degrees (for a 6 degree ILS it would be +/- 3 degrees) and each dot is half that, or .75 degrees on the low side and 1.5 degrees on the high side.

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  2. nAlex on Feb 05, 2022

    To complete John’s answer : the full defection on the G1000 is 10 degrees (for a VOR).
    So one dot is approx 4 degrees, 2 dots is 8 degrees, and the full deflection is slightly more than 2 dots.

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