
 INSTRUMENT NAVIGATION
Figure 21
So, in both cases you have noted that you are actually flying a ground speed of 6 NM/min or
360 kts, thus indicating a headwind. The canting of your pencil indicates a crosswind;
therefore, confirming the actual wind from the northwest.
To complete a good pointtopoint, you must now apply your knowledge of the wind and turn
from your current position (078°R/38) to a new course and the desired point of 025°R/60,
remembering to crab to hold yourself on that new course. You can then determine your
estimated time of arrival by recalling that you have done 6 nm/min, and applying that knowledge
to the distance you measure from the 078° R/38 to the 025°R/60. The distance is about 48 NM,
so you would arrive in 8 minutes.
SUMMMY
You have learned three methods of pointtopoint navigation. The pencil/eyeball method is
the method to utilize in the air. Although initially not as accurate as the CR2 method, it saves
time and will become accurate as your proficiency develops. Your eventual goal is to involve
logic as much as possible to solve your pointtopoint problems. Until that time, the
pencil/eyeball method and, to a lesser extent, the CR2 will be utilized to help your
In addition to the TACAN and VOR, the T34 can utilize its Area Navigation System
(RNAV) and accurately solve for pointtopoints through its remote navigation computer.
Waypoint (pointtopoint) bearing, distance and angular crosstrack deviation are continuously
supplied by the RNAV computer. Utilization of this system will be further examined in your
Flight Preparation Classes.
518 TACAN POINTTOPOINT

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