GG-Tracker tracks your cellphone / mobile-device using GSM Cell Tower location or GPS. It displays your position on the internet using Google Maps. If only a GSM network is available it retreives your location from its self-learning internal database or connected app. If it has GPS available it will use that. This means that GPS is not required anymore for positioning, please check the explanation pages for more info.
GG-Tracker Basic Map
GG-Tracker Location Heatmap
Other people's implementations
It's nice to see that my software is actually used. Below will be a list of all the people who have reported their usage to me, there might be many more out there. GG-Tracker is licensed under the GNU license, also known as open-source software.
Are you running GG-Tracker as well? Please be so kind to drop me a line.