https://nakedsecurity.sophos.com/2017/07/05/illinois-poised-to-ban-geolocation-tracking-without-consent/

Geolocation information’ means information that: (i) is not the contents of a communication; (ii) is generated by or derived from, in whole or in part, the operation of a mobile device, including, but not limited to, a smart phone, tablet, or laptop computer; and (iii) is sufficient to determine or infer the precise location of that device.