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APPENDIX C
C100. GENERAL
The purpose of this section is to provide the experienced RI student with greater comprehension
of selected radio instrument topics. Before delving into these concepts be sure that you have a
solid background in the basics of RI.
The information and techniques within this Appendix should not be viewed as required
procedures but as information to use in your execution of assigned maneuvers.
You are no doubt familiar with the concept that as your distance from a NAVAID increases, the
spacing between given radials also increase. However, just how much does radial spacing
increase as you move from the station?
To answer this question, consider the following. At a distance of 60 NM from the station, there is
one mile between each radial. As you get closer to the station, the radials are closer together.
(For example, at 30 NM from the station, there is one­half mile between radials or two radials per
mile; at 10 NM, it is 1/6 mile between radials, which equals six radials per mile. (Figure C­1) In
general, 60 divided by distance from the station equals the number of radials per mile.