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I have had this problem before. You have to make sure you have the proper map data selected in Mapsource before you start selecting data to download to the GPS. I had multiple maps loaded into Mapsource but they weren't all unlocked for the multiple GPSs that I own. if I got the licenses mixed up between the units it wouldn't work. There should be a setting in your option menus.
You have use the unlock wizard to install the key that is provided with the software. When I bought my Mapsource CitySelect, it came with two keys. The way Garmin does it is, you can install the software as many times as you want on as many machines as you want, but can transfer the maps, data, etc ONLY to unlocked devices. Last I checked Garmin wanted $75 for additional unlocks. Some data is not locked, like Topo maps and some tide points since this data is obtained (by Garmin) from the gov't, which is free for us (wel, minus taxes we pay). Contact Garmin support, they are very attentive.
Step 1: Get "garmin_keygen_v1.5.exe" 2008 by JetMouse Step 2: Follow the bottom instructions...
11) Go to "Utilities-Get Unit ID" and Find Device with your GPS plugged in USB. Write down Unit ID. 12) Run Garmin Unlock Utility, Enter that Unit ID at the top. 13) Select under "Select Map Product" 14) Enter the type of map you're using or if you have the Map ID enter in a custom map, use the Generate button to get 25char code. 15) In MapSource go to "Utilities-Manage Map Products" 16) Go to "Unlock Regions" Tab, and hit "Add...", enter 25char code, comment optional 17) Now on the main MapSource screen, type 'm' to enable map tool. 18) You should see a large white rectangle, with rectangle outlines (these represent NA maps) 19) Click and drag to select them all, you can click "Map Set Name" if wanted. 20) Click the "Send to Device" button. Wait an hour. Enjoy.
The new maps will be unlocked to your GPS using the code Garmin supplied you.
You will have to add these maps to a second SD card if your present card is full, or else purchase a larger card. Since all the Mapsource NT 2008 Europe maps are 1,395MB in size, you'll need to purchase at least a 2GB SD card.
Hi check out this wed site, it will help. HT maps for the Nuvi are NOT for PC use. The map load onto the GPS as you install Mapsouce. Reinstall Mapsouce and take option 3 on the startup page of the program.