Figure 7-5

STUDENT GUIDE

VISUAL NAVIGATION

WIND COMPONENT BREAKDOWN

HEAD/TAIL WIND

CROSSWIND

360 ------------------------------------- ADD FULL WIND

ZERO

030 ------------------ ADD 3/4 OF WIND

1/2 OF WIND

045 -----

ADD 2/3 OF WIND

2/3 OF WIND

060 ---ADD 1/2 OF WIND

3/4 OF WIND

090

ZERO

FULL WIND

120 -- SUBTRACT 1/2 OF WIND

3/4 OF WIND

135 --------

SUBTRACT 2/3 OF WIND

2/3 OF WIND

--------- SUBTRACT 3/4 OF WIND

1/2 OF WIND

150

180 -----------------------------------

SUBTRACT FULL WIND

ZERO

FOR T-1/T-39 VNAV, USE 1 CRAB FOR EACH 5 KTS OF CROSSWIND.

Figure 7-5

7.8. COMPENSATE

7.8.1. The Fix enabled you to Analyze the winds, now you need to Compensate for their effect

on the course and mission timing. Calculate crab just as you did in instrument navigation. For

T-34 flights at 150 kts, each degree of crab equates to 2.5 kts. of crosswind (150/60). In the T-1

at 300 kts airspeed each degree of crab equates to 5 kts. of crosswind (300/60). Rounding wind

values to the nearest 5 kts, adjustments to base heading are always in 1 increments.

7.8.2. Head and tail winds also require compensation. Make adjustments to your base airspeed

(the indicated airspeed you calculated to fly 300 KTAS, see Figure 7-1) in 5 kt increments for the

head/tailwind you encounter.

7-8