All Garmin detailed maps have the name GMAPSUPP.IMG
So, if you have several maps (i.e. Europe and Thailand) you can only use one of them with that name. You could upload more than one map to your SD card but you have to change the file names.
With the help of for example X-Plore you could do that on your device without the use of a PC. When you are in Thailand, you just change thailand.im$ in gmapsupp.img and when you are in europe you change europ.im& in gmapsupp.img
I assume you have the Garmin Base Map to have an overview of the world (gmapbmap.img).
Good luck
or , better, you can insert them in your card as gmapsupp.img and gmapsup2.img so you can see them both
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