It uses GPRS and GPS technologies which allows to easily perform realtime tracking. Here idea is simple: read the GPS coordinates (longitude and latitude) and send them by using HTTP request to a web server. Then use a web browser to load the PHP webpage which uses GOOGLE MAPS to show the location in realtime.
Waveshare GSM/GPRS/GNSS HAT (SIM868) controller for Raspberry Pi
Android App for https://github.com/doorbash/gps-tracker
GPS tracker made with Arduino and sim868. Backend: https://github.com/doorbash/gps-tracker-backend
Backend for https://github.com/doorbash/gps-tracker. Android App: https://github.com/doorbash/gps-tracker-android
A sim868 controller and an answer machine build on top of that
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