You can't. But you don't need to.
Go into Setting, WiFi. Tap on your current connection, you will see "choose a network" and a list of router names. (This is on iPhone. I don't have an iPad yet, so this may be somewhat different.)
My, my, how the heck did it do that?! A list of all of your neighbor's WiFi signals, even though you aren't connected to them. Sheer magic!
Actually, not sheer magic. Every WiFi router sends out "beacon" signals constantly, announcing their name and a unique ID number. (The beacons can be turned off, BTW, for enhanced security, but most people don't do that.)
Skyhook maintains a database of WiFi router locations. They get the locations from people registering their own routers through their web site and (mostly) by them driving down streets collecting the information. Location Services looks for beacon broadcasts, gets the ID of each router it sees, and looks them up in the Skyhook database.
They triangulate your location based on nearby routers.