Your MapSource coupon or registration code is valid for use with your own Garmin GPS unit. This agreement provides a one-user license, and it is illegal to share this data with others. If you own multiple unlock compatible Garmin GPS units and have unlocked maps to one, you are generally allowed to unlock the same maps to one other compatible Garmin unit you own for no additional charge. (See our Unlock FAQ page for further details.) HOWEVER, this is NOT applicable to models which come with detailed maps pre-loaded and without CD or DVD-ROM's in the packages, such as the StreetPilot C330, C340, i5, 2620, or 2660. Also, if you own one unit which can use the MapSource NT format but a second which cannot, you will NOT be able to unlock the NT maps to that second unit.