Too windy?

[DashSlow]

Don't forget to turn the true (reported) wind into magnetic (compare with r/w) wind when calculating the crosswind values

Oh - have I completely forgotten all about met theory? Are metar winds not magnetic?

PS: I have never really given a damn until now, having only flown in areas where variation is less than +/-2degrees

Edit:
Disregard - I have already found a good answer elsewhere on this informative forum http://www.pprune.org/forums/showthread.php?t=300546