@budiperkasa
Yes you can but you'll lose the full search capabilities if any .img has been 'reverse engineered' at all. Best to join maps with MapInstall from gmap folders to make a combined image file if you're not sure of the source of the images, but if you made them yourself from gmap folders using MapInstall then NP to join then with this method.
My point is then, why not just use MI to make one image from the separate gmap folders in any case if they're available, 'coz that's the best way to be 100% sure and simply cut out the 'join image step'.
EDIT: Thanks Caty, added info to make it clearer.
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