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An aircraft is flying a heading of 245° towards a VOR at FL300. The HSI displays a "selected course" of 255° with a TO-indication. The variation at the VOR is 15°E. Variation at the aircraft position is 16°E and the deviation is +1°.

When the pilot keeps the CDI on the left inner dot on a display with two dots on either side:

  • A
    the VOR will be approached along radial 070.
  • B
    the aircraft will pass north of the VOR.
  • C
    the VOR will be approached along radial 080.
  • D
    the aircraft will pass south of the VOR.

Refer to figure.

Selected course: 255º TO, meaning that the aircraft is positioned on or close to the reciprocal of 255º (over R075).

Full deflection of a CDI equals 10º. There are 2 dots on each side, therefore each dot equals 5º.

The CDI is on the left inner dot which means that the selected course is 5º left of the aircraft and, consequently, the aircraft is 5º to the right of the selected course.

  • The selected radial is 075º inbound. Since the aircraft is 5º to the right of it, it is flying on radial 075 – 5 = R070.

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