In Flight Winds
Information Sheet No. 4.6.1I
While in flight, aircrew will periodically be required to fix the aircraft's position by visual or
electronic means. Once fixed, Track (actual flight path) and Ground Speed (distance
covered/time) can be determined. With the True Heading and True Airspeed, all the
information necessary to compute actual in-flight wind direction and velocity is available.
IN-FLIGHT WIND THEORY
The actual winds encountered in flight will often differ from the forecast winds. In order to
stay on the intended course, the Warrior-Navigator must be able to compute the actual
winds aloft using the information gathered during the flight. After takeoff from the departure
point and enroute to the destination, the aircraft position will periodically require fixing by
either visual or electronic means, or both. Once a fix is determined, Track as well as the
ground speed can be calculated. These values, combined with TH and TAS, can then be
inputted into the CR-3 to determine actual in-flight winds (Figure 6.2-1).
Figure 6.2-1 Wind Triangle