i am not sure i understand--
recommend you merge many india maps with gmaptool--
or two maps in main memory's garmin directory--renamed gmapprom.img and gmapsupp.img---and one on the garmin directorey of you sd card-renamed gmapsupp.img
-of the three maps -- only the one with the highest priority will display on top-
other maps will display under it but you can't see them---until you deselect the one displaying on top.
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