If you've ever wanted to know where your car, truck, caravan or possibly even your boat is in real-time, then the project described by Instructables user "boraciner" may just solve your problem. They've designed a simple Arduino-based system that uses a GSM modem and a GPS receiver that can send the GPS coordinates via text message when requested by a pre-determined mobile phone. The system is also a good framework for applying more features - such as remote-deactivation or controlling the central locking.
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If you're new to Arduino, the first step is a solid board for your projects - our Freetronics Eleven - the Arduino-Uno compatible with low-profile USB socket, onboard prototyping space and easy to view LEDs:
