Figure 13 - P-8010109

INSTRUMENT NAVIGATION

This type of flight path occurs because you have not yet corrected for the reason you get off

course in the first place, namely wind. If you will reexamine Figure 12, you should notice that

our aircraft has been blown NW of course; therefore, it probably is being subjected to a SE

wind. If the aircraft turns to the new heading of 220 it will continue to drift NW because of that

continuing SE wind. What it must do is attempt to actually fly along the solid. line representing

a course of 220 by using a heading that crabs sufficiently into the wind to neutralize it, perhaps

215. See Figure 13 below.

Figure 13

CO-DME SOLUTION

A logical extension of what we've been doing for the last few pages is the co-DME solution.

When an aircraft is in transit to a certain point, it is likely to pass many radial/DME combinations.

If one of the positions that it passes has a DME which is equal to the DME of the point to which it

is flying, a co-DME situation exists. At this point the aircraft has an equal number of radials above

and below its wingline.

Example:

Desired position 360 /50

Present position 090 /50

TACAN POINT-TO-POINT 5-11