Yes, that sounds good, however there's no real need to use BaseCamp, it will only invoke MapInstall when you click 'Install Maps' under the 'Maps' tab in any case. So you can simply open MapInstall directly. If you use the patched version you can send the img file to any drive including your system C: drive if you wish [run MI as Administrator]. If you're determined to send it to your 255's internal memory then select its drive letter of course. The map will be installed to its Garmin folder as gmapsupp.img and if there's an existing file of the same name in there it'll be overwritten. If you already have an earlier map covering the same area as the new map named gmapprom.img then you'd best remove it along with any unl and gma codes too [make back ups], or at least deselect it from the device's map list. I would prefer that you put your little map on a small microSD, what you need for Quebec will fit on a quite small card as those 7 tiles shown in the pic of Post #18 take up less than 126MiB [~132MB] anyway, if you drop a tile or two it'll even fit on an old 128MB card. Your call of course where you install it.