In message om, at
22:26:44 on Mon, 26 Aug 2013, "dennis@home"
remarked:
However, should you be using a laptop (let alone mobile) with wifi,
there are tools/databases that people can use which will quite likely
locate you within a few hundred yards.

That's rubbish.
There are tools you can use to locate yourself to a few hundred yards.
he wifi identity is not usually passed beyond the router/ap unless you
send it at the application layer.

Which is what happens behind your back if you aren't careful.
--
Roland Perry