I love forums and the Internet in general ask 5 people get 5 different answers....if you ask a dealer they will tell you it cannot be purchased separately it is part of the entire navigation unit, and you will have to replace the entire unit, hence my response above. Call nav tech and they will tell you to contact the dealer they do not sell the cards. The correct answer, you need to contact the manufacturer which is Clarion not nav tec, nav tec only deals with the map upgrades. You will need to pull the head unit and get the info from the back of the unit, then contact clarion, they will provide you with a new card that is married to the unit. Then the fun part begins, you will have to go to the dealer and have then program the nav unit. If any one can prove me wrong I offer $100.00 for accurate information
How do I know, I am in this process right now as I bought a used leaf without a sd card.