Formerly Known as Newbie
Join Date: Mar 2002
Location: Helsinki, Finland
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The one you linked to has no mapping. If you look at the "map" screenshot, it shows trail (GPS plots this) and a couple of user-defined symbols. Other than that it's just a blank screen, no topographic info, no streets, no nothing. Additionally, the seller does not advertise maps for this device. If there were any, they would want to sell them as well, as maps can be quite expensive.
Any mapping GPS will have some kind of built-in base map, but that is usually not detailed enough. And as these devices are used for sailing, kayaking, trekking, biking, driving and whatnot, one map is not the best for all purposes.
If in doubt, ask the seller. If you want to make sure, go to manufacturer's web site and check from there. You'll find Garmin for example has categories like "Basic" vs. "Mapping" when it comes to portable GPS devices.