You used to be able to unlock maps to 2 Garmin units. Checking today, looks like you can only unlock to one (with the exception of Bluechart CD's).
Quoting Garmin:
"Question: What is Garmin's Unlock Policy?
Answer:
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 would like to obtain additional regions or utilize more than one Garmin GPS unit you own, you will need to purchase another code for each unit. (The exception to this is with MapSource BlueChart CD data. The region[s] you have unlocked to one compatible Garmin unit you own from a specific BlueChart CD you may unlock to ONE other compatible Garmin unit you own for no additional fee.) "
This used to be a problem with Mapsource maps bought on eBay: one unlock had already been used, so you only had one left when you got the CD. Mapsource micro-SD cards can be used in any compatible GPSr's however, so you can sell one when you are through with it, like I recently did with my Spain/Portugal card.



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