The purpose of the Mobile GPS Demonstration Platform (MGDP) project is to demonstrate a proof of concept for the integration of a number of emerging technologies including: Embedded/Realtime Java, Mobile, position-based applications, GPS (Global Position System) technologies, Wireless/Mobile connectivity, XML-based technologies (Web Services. XML, SOAP, WSDL, JAX-RPC, etc.), and server-side J2EE (including EJB and DBMS persistence). The MGDP has been constructed using commonly available, inexpensive hardware and software to illustrate that applications of this nature are very feasible using existing tools and technologies. It is hoped that the MGDP project inspires others to push the threshold of what can be done with position-based computing, XML-based technologies and the Java platform.