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INSTRUMENT NAVIGATION
The following example (Figure 25) illustrates a turn at a fix not located at a navaid:
Figure 25
You must be able to visualize your navigational situation from the indications on the RMI,
keeping in mind that your position can be defined from the tail of the #2 needle. There are three
rules regarding course corrections. T H E S E R U L E S A P P LY TO NO-WIND SITUATIONS.
They are the basic principles for determining corrections to return to course; however, the
presence of wind will cause you to modify these rules as the need occurs.
Rule One: The tail of the #2 needle always moves in the direction of turn and the head of the
#2 needle will always move in the opposite direction of turn (heads will fall, tails will rise).
That is to say, in all cases while tracking outbound from the navaid if you want the tail of the
#2 needle to move to the left, turn to a heading that is left of the tail of the needle. If you want it
to move to the right, turn to a heading that is right of the tail of the needle. The situation is
opposite while tracking inbound to a navaid. If you want the head of the #2 needle to move to
the left, turn to a heading that is right of the head of the needle; if you want it to move to the
right, turn to a heading that is left of the head of the needle.
In Figure 26, you are proceeding outbound from the navaid heading 180, maintaining a
course of 185". (Remember when radial tracking outbound from a station, the radial and course
are the same). If you want to intercept the 190"R, you need the tail of the needle to move to the
right. Turn to the right of the tail of the needle.
RADIAL TRACKING AND COURSE CONTROL 3-17


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