>Gather mac addresses that are nearby. If an app has "coarse location" permissions, I believe it can already do this, or at least could do this a few years ago

>Gather mac addresses that are nearby. If an app has "coarse location" permissions, I believe it can already do this, or at least could do this a few years ago. Phones give quick, inaccurate location data based on what WiFi SSIDs are around. Google started their database of those SSIDs by wardriving and logging everything. There was a court case about it.