Depending on who you buy it from, you can usually have them load a map on it for you.
You can also download maps, modify them on your computer/pc, or make your own. Or, as you ask, you can take your bike to a shop that is properly equipped and they can make you a custom map - that's actually the way to get the best map, as it's made for your particular bike. When you leave the shop, you'll be all set.
To load a map onto your pc unit, you'll need to have a laptop or be able to get your computer within the length of a serial cable that you'll use to load the map from your computer/laptop to the unit on the bike while it's running. The pc comes with instructions and it's really easy.
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