Is that plate georeferenced?
Oddly enough MM publishes (for free) the UK airport taxi plates, and they are georeferenced.
MM recommend that you use iTunes to transfer maps & data to the iPad.
Itunes is a virus I try hard to avoid
It keeps doing weird things e.g. it syncs stuff you didn't want to sync. Normally I use 3rd party progs like this to drag/drop stuff to the Ipad, though only some apps' workspaces are thus accessible. Goodreader is accessible in that way (I have put loads of avionics manuals etc on it that way) but most apps aren't. I don't think MM is.
I am somewhat put off using the Ipad as a moving map GPS, having found out how crap the internal GPS is when airborne. I already have a bluetooth GPS connected to a rooftop antenna but it isn't compliant with the Church of Jobs protocol. I would replace it with a CoJ compatible GPS if I could find one which does standard serial NMEA (so it works with everything else I have), has an external antenna input, and has an external power input.