MH & GS graphs !

[Jepp]

Apologies if this is a dumb question, but..................Why arn't there any pre printed graphs to calculate Magnetic heading and Groundspeed instead of using a whizz wheel ?. We see them for everything else T/O distance, weight and balance but not MH and GS !

Thanks in advance

J

[englishal]

Probably because they are either a) very regional - Mag variation differs pretty much everywhere, or b) GS is based upon wind speed as well as altitude etc etc......