Once airborne, you can roughly determine the existing crosswind by noting the trend in
heading changes needed to keep on course.
Example: In order to maintain a course of 090", you start heading 090°, but soon must
come to 094°, and finally to 096°. Therefore, a right crosswind exists.
By putting two concepts together (headings and ground speed differences) you can determine
the specific quadrant, (NE, SE, SW or NW) from which the wind is blowing.
Let's assume we're on the 105ºR/40 DME and want to go to the 025º R/60 DME and your
TAS is 420. The course is 350º. (Figure 18)
Now let's assume that you find that your progress toward your desired point is slower than
you expected and that you constantly have to turn left to maintain your track. The combination
of these two factors indicates that you have a wind from the Northwest.
Note how this situation would look on the CR-2
TACAN POINT-TO-POINT 5-15