I recently bought Garmin DVD, "24k West Topo". This being my first GPS, I thought I could view maps in color like a real topo, in fact I'm sure right after I downloaded maps from dvd to unit I could....Now I'm getting light brown background with 400foot contour interval- very little detail-not much better than the base map that came with the unit. Not what I expected for $130...any suggestions? I'll be calling Garmin, but thought I'd try here first