that you will
learn a shortcut for approximating your position in real
world flight. This is actually a very handy little trick
and one that is easy to learn.
First of all,
remember that radials extend outward from the VOR
transmitter. They start at the station and extend
outwards like the spokes on a wheel. There are 360 of
these imaginary spokes, each named to match their
magnetic outbound bearing. You define your position as
being on one of these radials. The aircraft's heading is
more information, view the "VOR
Navigation" lesson at the Gold Seal Ground School.)
You can roughly locate your position in relation to the
VOR simply by looking at the CDI needle and the
Experiment with this using the interactive graphic
If the needle is centered with a From flag, you are on
the radial indicated at the top of the indicator. If the
needle is centered with a To flag, you are on the radial
indicated at the bottom of the indicator.
If the To/From flag is "off" or not visible, you are
located in the Zone of Ambiguity. This is roughly a 20°
pie slice to the left or right of the indicator dial. If the
needle is left, use the pie slice on the right. If the
needle is right, use the pie slice on the left. (If this
is confusing, click on #3 and #7 in the graphic below.)
If the needle is either left or right and a To/From flag
is shown, your aircraft's position lies in the
indicator's quadrant that is opposite from the needle
and flag. You are where the needle and flag isn't.
If the needle is to the left, you are in the right half
of the dial. If the flag is "To", you are in the lower
half of the dial. Put these two together and you are in
the lower right quadrant.
Below is Fig 29 from the Knowledge Test
Supplement. This is the graphic you will use in
your written test.
The only difference is that this one is
interactive. Look at each
indicator below and imagine roughly where your aircraft
is located. Then click the indicator to see the