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Hi, I'm just figuring out how to transfer maps from the interwebs (OSM and other sources) only my GPS.

I have a couple of questions:

Is there a qualitative difference between Base Camp and MapSource?

Is there any advantage in directly adding an .img file to the mini usb in the GPS unit, and if so, is there any way one can add to a mapsupp file?

I found that when I did the latter, it certainly was easier than loading maps through BaseCamp, but I could only load one map at a time as mapsupp - so I couldn't access all the data I needed.

Hope that made sense, thanks!