The good folks at AP need to make a change on their end to move your subscription from the old 700 unit to the new 720 unit. Similarly, they will need to set up the new 700 owner's account to be tied to that unit. You will need to call Adventure Pilot support during normal business hours to accomplish this, but it will only take a couple of minutes. (The new 700 owner will need to call separately, too, of course.)