Magnetic Heading = 255°M
Magnetic Variation =40°W (Variation West Magnetic Best)
True Heading = 255°M - 40°W = 215°T
On CRP-5 Wind Side:
Place Centre Dot over any convenient TAS, e.g. 500 kts
Place Wind Direction = 235°(T) under True Heading Index
Count down 120 kts and make a Wind Mark (over 380 kts)
Place True Heading = 215°T under True Heading Index
Note Wind Mark has moved to 6° Left indicating a Ground Speed of 390 kts
Slide Wind Computer down to place Wind Mark over 375 kts
Note Drift = 6° Left