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I just registered a new Garmin Montana 600 and installed Basecamp.  I downloaded the Texas topo from GPSFiles and installed that such that there is a collection of  numbered .img files along with a .tbd file.  I read the tutorial on installing the map on a PC using Basecamp.

When I right click on my device in Basecamp there is not a selection for installing a map.  Under utilities, the Install maps selection is greyed out.  Am I missing something?  Basecamp sees my gps, it just does not give me the choice to add a map.

Thanks in advance.