Not from what I have read - only one device.

I just routed a series of rides on ridewithgps.com and experimented with tracks and routes and everything went smoothly until I got to a 70 mile ride done in tracks and the ride was truncated when it was sent to the device using MapSource. I had to filter the track down to 500 points, from what ridewithgps gave - 1200 points.

That is another gotcha that garmin threw in without documentation. The routes let you store 50 routes with up to 250 points each, while the tracks let you store 20 tracks with up to 500 points each. The routes is documented in the owners manual, but the tracks wasn't.

Seeing as an active track allows up to 10,000 points, I was surprised at the partitioning of the memory, regardless of whether you have 20 tracks stored, or not.

In any case, this has been a steep learning curve for me, but I think I now have the functionality that I bought the unit for.