I don't need a Wizz wheel - If I need to calculate drift, I simply take Sin of relative wind to give me a cross and headwind component then add that to my course to give me GS and course to steer...
Of course the Log Tables I use are JAR-FCL approved log tables.
If GPS 1 fails, I use GPS2. If that fails I use VORs. If there are no VORs I use NDBs. If there are no NDBs I may use Atlantic 252 or some other station in Newfoundland....
