1. Because you bought a GPS without maps.
2. Because a GPS is slightly more complex than a toaster.
3. There is a learning curve.
For maps you have these choices:
Buy maps from Garmin. GB Explorer might fit the bill, because you want contours. City Navigator doesn't have them. Bear in mind that maps will become outdated and updates cost money, too, unless you pay up-front for lifetime updates.
Find and install 3rd party maps. If you look at garmin.openstreetmap.nl you should be able to figure out how to download a map of GB. From the available options choose the Mapsource install file, which installs also into Basecamp. (I understand that you have BC installed.) This is an executable (program) file, so you just double-click it and follow the instructions. You can then send the maps from BC to your GPS.
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