I agree with what he says munro.
almost all of the maps are editable, except for the ones that don't have the axes described immediately before.
there are different maps that you use axes "common" this? described only once and used for pi? maps. these do not ? the case for change.
about the size you can? do what you want to sell it? the new size does not exceed that premodifica.
any unused points can be filled with ff or 00 but are unused