Hi nermoz,
Welcome to Laptop GPS World.
When you press the "scan" button to look for your GPS receiver in your MS AutoRoute, the program recognizes your GPS receiver, but it says com port is being used when you try to use it?
Hmm, I personally use mostly USB GPS receivers, and at the moment I don't have any Bluetooth unit around. But yes, you don't need any additional software (driver, etc). It is just supposed to be plug-and-play. On occasion I used Bluetooth GPS units, and I haven't experienced this kind of issue . Sorry, I don't know what to suggest. Hopefully some other user will give you a quick answer, so you can use your AutoRoute during your trip.