I spoke with Garmin today. In the past, you could buy topo maps and install them on your unit. When you upgraded, you removed your maps and installed them on your new unit. NO LONGER. Garmin has now locked all maps to one serial number. If you buy maps, they are permanently locked to one serial number and they are lost to you if you sell that unit to upgrade. When questioned, Garmin simply says: Unfortuneatly, mapping products do not transfer to newer units. You would need to purchase new mapping for each unit you have. Please let me know if you have any further questions. With Best Regards, Amy Ch. Product Support Specialist 2nd Shift Outdoor/Fitness Team Garmin International 913-397-8200 800-800-1020 913-440-8280 (fax) Att: Amy Ch., Associate #6013 www.garmin.com Additional solutions may be found at http://www.garmin.com/garmin/cms/site/us/support/searchsupport I WILL NEVER BUY ANOTHER GARMIN PRODUCT!!!