QUOTE(trdehmer @ Jan 16 2008, 08:18 AM)

Can the Topo US 2008 be downloaded to the GPS at any time - or does it need to be done before uploading the trail maps?
I have everything downloaded to my computer, but I don't have Mapsource - how/where can I download that or is that some separate software I also need to purchase?
Do you have Topo US 2008 (or any other Garmin detailed maps such as City Navigator etc)? If so you have Mapsource. Topo maps and trail map must be uploaded together in one shot if you want to view the trails overlaid on Topo.
If you don't have Mapsource (Topo 2008, City Navigator etc) you can get a copy of Mapsource installed on your computer by doing the following.
First install the Training Center for Windows software.
Training CenterThen install the Mapsource update.
Mapsource UpdateYou only get a basic basemap, but all other features of Mapsource
work...including managing of your tracks, waypoints, routes and upload of your custom maps to your GPS.
Note: no need to run Training Center...just install it and then install the Mapsource update...then run Mapsource.