[Edit] You can also manually isolate the corresponding file by a process of elimination. Just rename the IMG files one at a time (e.g., gmapxxxx.img to gmapxxxx.bak), restart GPS, and check the 'Map Info' screen to see which file is which mapset. FYI. [/Edit]
It's much easier to use the program [Only registered and activated users can see links. ]. Gives you the right information of the img-files and you can also see which maptiles are in the mapset.
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