This is more likely down to GPS marking, tracking as others have also stated.
So my wireless router is acting as a GPS device? And Google is matching it to the MAC address they sniffed when they drove past my house under the auspices of creating Streetview?
NO if its tracking via MAC they either got that info from your wireless router when they did street view or you signed up to one of their location apps and gave them that info (maybe unwittingly) when you signed up...... I frankly doubt either though, it wouldnt be a reliable way to track a location.
The easiest way to find out if it is actually tracking a modem/router and not just recalling info from wirelessly detecting it possibly months ago would be take your router to work one day if possible plug it in and then see where it thinks you are.
Or even easier turn the router off and totally unplug it, access the net elsewhere and see what it says about you then.... If it tracks you and your router personally it obviously wont be able to find you if the thing isnt plugged it.
I suspect it tracks you based on the apps account and info you feed it, or it will still say your router is at home even though it will be switched off and unplugged so they cant possibly be actually real time tracking it.
One things for sure if it is in any way accurate for many people it definately is not done via IP address, IP address unless you live in a big server room wont track right down to your household. For many if you lookup your IP address it wont even be your home town.
Edited by deleted (Mon 30-Aug-10 22:51:28)