If you are interested in specific trails in the White Mountain National Forest in NH, you can obtain individual trail GPS tracks using the Appalachian Mountain Club's on-line White Mountain Guide. That's a subsciption service ($15/yr for non members). You'll have to go through a few cumbersome steps to get the available data into .gpx format that you can then open in Mapsource and load onto your GPSr. For specific planned hikes I've found the resulting tracks to be quite accurate. It's too bad all that trail data is not available on a single transparent map that could be downloaded. I'm surprised that the AMC hasn't offered something like that for sale since they have obtained all the necessary data, which I understand was developed by actually walking all the trails with a specialized GPSr unit.