Here are some useful questions and answers from the Garmin help websight.
Question: Can I register my Garmin Mobile XT card?
Answer: The Garmin Mobile™ XT card is considered an accessory item. It is not an item that can be registered at this time. If the card is ever lost, damaged or stolen, a new card would have to be purchased. However, Mobile XT has been discontinued by Garmin and is no longer availble thorugh us directly, it may be available through third party vendors.
Last modified on: 03/23/2010
Question: Can I transfer maps to a larger memory card from my Garmin Mobile XT card?
Answer: No, the mapping on the pre-programmed Garmin Mobile XT card is locked to the internal serial number of that specific card. If you attempt to copy the mapping onto a larger card, you will be asked to enter an activation code which you will not have. Last modified on: 06/20/2008