sbright33:
There is a database you can use. Or a website. Not sure about cost.
I'm aware that Google got into a lot of bother when it turned out they were collecting information about all the unsecured WiFi hotspots they found. If you had access to that database, you would be in with a chance. I'm not aware that Google were making it publically available, though. And obviously that database is rapidly going out of date. I guess that BT will know where their BTFON hotspots are but whether they would tell you is another matter. Other than that sort of approach I can't imagine how you would figure out which hotspot was where. I would have thought that using GPS for location was far easier, more accurate and more reliable.