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I purchased a etrex 30 and installed some maps from Topo Canada cd I had onto a sd card using mapsource. I also downloaded some maps from this site and installed using mapsource. What I didn't realize is that every time I installed a new map, it erases a previous one. How do I go about getting multiple maps installed?
I read online about renaming the .img file on the sd card in the gmapsupp folder. I can't open the gmapsupp folder. It says it is a "disk image file" and need to download a program to open it?
I have spent hours of googling and trying to figure this out.
Any help is appreciated.

Thank you