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im trying to get more than 1 state on a mini SD for my garmin astro 220.  i can find just parts of iowa in defferent downloads.  i download is just iowa.  can i put more than 1 map together to build a map of say iowa missouri illinois indiana ohio kentucky michigan minesota to put on my SD.  or do i need to make seperate SD cards for each state?  thanks for any information guys!