course. Note that the CDI provides an easily interpreted picture of course deviation and
correction, but actual aircraft position (185º radial) is more easily seen on the RMI.
Figure 65 Aircraft on 185º Radial
Thus, as a rule, you will use the RMI for orientation, and the CDI as an initial indication of
approaching the assigned course (specifically within 10º of course) and fine tuning once established
on course. Keep this dictum in mind throughout the Radio Instrument Stage and you should have few
problems with disorientation.
Reverse Sensing We have just covered the normal use of the IND350. Now we will
discuss a possible misuse of the CDI portion of this instrument.
The CDI will be centered whenever the aircraft is on the radial selected by the OBS, or on the
reciprocal of that radial. Keeping the above in mind, examine Figure 66A and B, noting the absence
of a TO/FROM indication. Can you determine the position of the aircraft?
RADIO INSTRUMENT FLIGHT PROCEDURES 6-13