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I can't figure out these transparent maps.  I downloaded one with hiking trails and installed it using the included wizard.  The map installs fine, and it there is no problem opening it with mapsource. The problem is, it is a trasparent trail map with no background. Its just a bunch of dotted lines on a blank tan background.  Using mapsource, is there a way to put the trail map over some kind of base map, so that there is at least a vague point of reference?