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Hi everyone.  New to the board.

I recently purchased a Garmin Astro 220.  I downloaded a couple of maps from this site onto my computer and then copied them to my sd card.  My gps isn't displaying any alternate maps that I can find, only the original basic map. 

Likely the map files aren't installed.  I have no clue as how to do that.  Do I install on the compter then load to the card?  Is there some way to install the files on the gps from the card?  Help!!!


Thanks