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\section{Our Prototype}  The Google Earth Phidget Controller utilises a number of interface devices:  \begin{itemize}  \item Circular Touch - Used for panning around the scene  \item Joystick - Pivots the camera  \item Slider - Used to zoom in and out  \item RFID Reader - Reads the location tags  \item Pressure Sensor - Used as a button to enable RFID programming mode  \item LED Screen - Displays relevent information based on input  \end{itemize}