I&#x27;ve been wondering whether you can use accelerometer data, which does not require user permission (on websites and mobile apps), to precisely determine geolocation for some users, which does require permission. This page makes Berlin commuters seem like a plausible target. A few more details here: <a href="http:&#x2F;&#x2F;andrewbadr.tumblr.com&#x2F;post&#x2F;132618372956&#x2F;projects-im-not-doing-device-acceleration-data" rel="nofollow">http:&#x2F;&#x2F;andrewbadr.tumblr.com&#x2F;post&#x2F;132618372956&#x2F;projects-im-n...</a>