Hi,
this converter is intended especially for pilots often flying Spitfire on servers that are set to “realistic” mode.
Im finding it very usefull. I cut the borders off and when flying I stick them under monitor by tape. Here you can download in *.xls format:
http://vasek.own.cz/files/Altitude(ft;m)&Speed(mph;kmh).xls
S! Vasek