If you know TAS, crab angle (difference between track and heading, a.k.a. drift angle depending) you can find crosswind by:
TAS (in nm per minute i.e. 420 kts is 7 nm per min.) X crab angle = crosswind component.
TAS + or - ground speed = headwind or tailwind component.
E.G. 480 KTAS with 5 degrees of right crab and 420 KGS =
40 kts of cross wind and 60 kts of headwind.
Next step is to scale out those two components on the RMI, as in TACAN point to point navigation
GF