Most, if not all, mobile devices have a GPS receiver in them, and most, if not all of them, support A-GPS. A-GPS as a technology is not designed with privacy in mind (in fact, it is specifically designed to not be private, as it sends the phones' IMSI to the A-GPS server), and one of the few providers of A-GPS services is Google. There exists, at present, no open source, privacy-respecting A-GPS service; mostly impacting FOSS on Mobile projects, such as Ubuntu Touch, who do not wish to use this Google service (and may not be allowed to either, as Google only officially provides SUPL services for Android devices, as far as I understand)

The OpenAGPS project aims to create a open-source A-GPS / SUPL (Secure User Plane Positioning) service. GNSS systems (such as GPS) are both surprisingly simple and complicated; the talk would provide a short overview into the functioning of a GNSS system, how assisted GNSS / A-GPS / SUPL works, how a privacy-respecting system could be built, and the current state of the OpenAGPS project.

This project has also received a grant from NLNet (Mobifree call) very recently; at the time of this submission we do not have any fully functioning code/codebase, although we hope to get a working prototype of the system in time for it to be potentially showed off as a working demo at FOSDEM.

Website (slight update: placeholder has been replaced with a blog, although it's still not got too much yet): https://openagps.net/ Source: https://gitlab.com/openagps/