Thanks so much for the quick replies! I just love forums...u can get straight to the point from people who KNOW in very little time. ;-)
Now off to spend another $80!!! LOL
ST
Like Neo_Geo said, you can't transfer NG TOPO! maps to the CSx, but you CAN transfer Garmin (Mapsource) US TOPO maps to it. They are not as detailed as the NG maps, but still helpful on hikes. If you have Mapsource US Topo, all you need to do is select the map segments you want with the map selection tool and send them to your device. If there are trails on NG TOPO! that are not shown on the Mapsource software, you can draw out the route on NG TOPO!, convert it to a GPS route and then export it to your CSx while it is connected to your CPU via USB or serial. The unit will then overlay the trail as a route on top of the Mapsource topo segments that you loaded on to it. You can also download trails from the Nat Geo MapXchange site and convert/send them to your unit using the same method.
Hope that helps