If your map in MS hasnt been unlocked by JM, it's not patched correctly.
read instructions in MS thread
[Only registered and activated users can see links. ]
When patched MS and unlocked the map ,send it to your hd (C:/Garmin/gmapsupp.img) and run Fast Img Unlocker on it to avoid the "Unauthenticated map" message.
this is already explained in post 41 as said above.
Try to read threads it helps