It's your fault my laptop knows where I am

The write-up by Andrew Moses details how Wi-Fi Positioning Systems work after encountering it through the browser geolocation API used by TopHat, a modern-day equivalent of the clicker which also takes validates attendence through geolocation. The post goes into methods of data collection and usage for access point SSIDs, BSSIDs and signal strength along with their location by both commercial vendors and community projects.

I discovered Andrew Moses' post through Hacker News where in the comments users describe various ways to feed their the browser's geolocation API.