I happen to own multiple Garmin Zumo GPS receivers, as we often use more than one of our bikes at a time. I've figured out how to load copies of Topographic maps onto the SD cards on both my Zumo 550 and the newer 660. The topos that I'm using were free 24K downloads of the Northeast from GPSFileDepot.com So far I've only been messing with these Northeast maps. I'm wondering a couple of things. Hopefully, someone else has already been down this path before and will have some answers / ideas for me. First, off, on the Zumo 550, with the map display set at either North up or Track up (modes that seem the most useful offroad) all seems to work well. But with the Zumo 660, no matter what display modes or screen resolution settings I use, the topo contour lines are very fat and monopolize the display pretty badly. I am wondering if this would also be true if I sucked it up and bought a copy of the Garmin Topo 24k maps on DVD? Anyone using Garmin 24k topos on a Zumo 6XX? Are the Garmin 24k Topo Maps worth the added price of admission? Does anyone have any experience with both those and the GPSFileDepot version topos? As far as I can see the Garmin maps have not been updated since 2008? Thanks in advance for any help.