I have a 2018 Passat wagon and I want a backup navigation card. Mine is an 8GB card with this lettering:

Volkswagen Navigation AS
Multi Region Map 2 (V7)
3GO 919 866 BF
258735 [printed sideways]

Cards like this occasionally come up on eBay and other places. How can I tell if one of these will work in my car? Does the card have to have exactly the same lettering? Does it depend on:

• Only the vehicle model?
• Only the navigation unit model?
• Country of origin?
• Combination of all the above?

For instance, this card is for sale from the USA: "3GO 919 866 BB" and only the last letter is different. Any good to me?