Not only those wardriving vehicles. They use everybody to scan the world's wifi networks. Well, except people like me who stubbornly turn off 'location accuracy' every time some app demands you turn it on.

I don't know exactly what gets sent to google, but it's certainly enough to identify and track (retrospectively) a huge part of the world's population.

Now I know you get tracked by the celltowers anyway, but still. Navigation works fine with the accuracy offered by just using GPS and it doesn't need all the wifi scanning, it's pure data harvesting.