just a quick follow up - I noticed that "is sounds unlikely" is doubting your statement - I am sure the directional / location of wifi is pretty accurate - its just my intuition about such things is so wildly off I would need to do some cacls on signal strength over metres of distance.
I guess the inverse power law applies, and signals are pretty weak to start with, so differences of a few metres will make a big drop.
How accurate are these systems (someone implied it came as standard on certain APs)? what is the density for say 50cm resolution - any papers on this?
thank you