The IND-350 (Figure 10) is the secondary navigation instrument in the VOR/TACAN
system and serves as an aid in interpreting the RMI. Its components consist of a Course
Deviation Indicator (CDI), a TO-FROM indicator, an OBS (Omni Bearing Selector), and a
VOR/TACAN selector switch.
The IND-350 uses VOR or TACAN magnetic bearing to show the aircraft's position in
relation to a selected course. The selected course is set with the OBS knob. The course
deviation indicator (vertical bar) will be centered if the aircraft is actually on the selected
course. For an off course condition the bar will be displaced to one side or the other. The TO-
FROM indicator shows whether the selected course, if flown, will take you to TO or FROM
the station. The VOR/TACAN switch enables the pilot to select VOR or TACAN information
for display on the CDI. If both the IND-350 and the RMI are operating and a course
discrepancy is noted between them, the RMI indication is more reliable.
NOTE: If there is a discrepancy between the RMI and CDI needles, rely on the RMI needle.
RADIO AIDS TO NAVIGATION 1-11