Possible workaround to USB problem
I was having the exact same problem with my Garmin 396, and I just accidentally found a workaround. I had tried plugging it into the left-hand USB slot on the keyboard, as well as directly into my Mac. Both failed with the "device is being used by another application" error. Then, just for the heck of it, I plugged it into the OTHER USB slot on the keyboard. To my surprise, it works! It doesn't make sense to me, but it works. So try different USB slots, perhaps it will work for you too.
Last edited: Jun 29, 2007