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Hopefully Buzz was able to help you. I don't check this site every day sorry for the delay.
I am assuming you bought a preloaded card from Buzz? If that is the case and you talked to Garmin and registered your GPS then it should just be an issue of turning the map on. If you go into the Map setup and find the screen where it lists your different maps you will need to find the one that says "DEM" and enable it. If that doesn't work then it is either the card or a miss-key on the serial number registration.