Most of the commercial GPS trackers require a SIM card. The system here described consists of two components:
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Sender This is a small device that collect GPS information and sends it as ASK moduled on 433 MHz. It also has a WiFi access point, so that when in reachable distance can be directly interrogated through embedded WebUI.
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Receiver As well a small device that receive the message from the sender and provides the same UI as embedded in the sender.
