Use the mnemonic:

• Variation West, Magnetic Best.
• Variation East, Magnetic Least.

Wind Correction Angle of +13º implies a correction to the right, resulting in a Wind Correction Angle of 13º Right. This adjustment shifts the True Heading to the right of the True Track by 13º. Therefore, the True Heading can be determined by adding 13º to the True Track

• True Heading = True Track + 013º = 105º + 013º = 118º.

Follow the steps detailed below in order to find unknown wind (CRP-5 method):

1. Adjust the slide until the centre dot aligns with the arc corresponding to True Airspeed (465 kt).
2. Rotate the window disc to position the True Heading (118º) beneath the TRUE HEADING index.
3. Calculate the Drift Angle. With True Track at 105º, derive Drift Angle as 13º Left (Port) from the window disc.
4. Identify the point on the slide where the Left Drift Angle of 13º intersects the arc for Ground Speed (480 kt) and mark it with a pencil.
5. Rotate the window disc until the pencil mark aligns with the centerline BELOW the center dot.
6. Determine Wind Velocity by measuring the length of the vector between the center dot and the pencil mark. In this case, with the center dot on the 465 arc and the pencil mark on the (approximately) 357 kt arc, the Wind Velocity is approximately 108 kt (465 - 357 = 108).
7. Read the (True) Wind Direction below the TRUE HEADING index. With the value 209 below the TRUE HEADING index, ascertain that the (True) Wind Direction is 209º.