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For simulation only in A320,without using MCDU intercept, is there a quick way to calculate both time & degrees needed to change course?

  1. For inbound course, I saw some calculations such as (desired course-actual course x3)÷ desired course. 2)Or I also saw just add 30° to your course and follow your rose VOR until it matches desired course.
  2. For a visual approach LFML 31R following ILS 31L which is let's say 313° and you are going visual to 31R, say 312°. Do you need any calculatoon for such small change in course or just manually bank the plane?
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  • $\begingroup$ I mant + desired course and not ÷ in 1), typo. $\endgroup$ Commented Aug 5 at 11:06
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    $\begingroup$ Whatever you meant, please use the edit button to correct your typo... $\endgroup$ Commented Aug 5 at 13:15
  • $\begingroup$ Related, possibly even a duplicate aviation.stackexchange.com/questions/53981/… $\endgroup$ Commented Aug 12 at 22:15

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How far out are you? In close, turn a couple degrees and re-intercept the one degree deviation.

If you are farther out, a quick estimate of the number of feet off the centerline for a VOR signal is 1 dot deflection per nautical mile is 200 ft. Typically one dot deflection is equal to 2 degrees off the radial.

You are 25NM out with 1/2 dot deflection or one degree deviation. That would be 100 FT deviation per NM or 2,500 FT which is less than a 1/2 mile off the centerline. Turn a couple degrees and re-incept the new course.

New problem. 10NM out with 2.5 dot deflection or 5 degrees off the radial.
200 * 2.5 * 10 = 5000 FT from the centerline. A bigger correction would be needed to re-intercept the radial before you cross the VOR.

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