Electronic maps are a key component of the latest in-vehicle navigation systems, but correctly attributed and working in conjunction with telematics technology they would allow for other applications, like hybrid navigation and advice on speed and other regulatory information.This paper outlines the design and implementation of a prototype in-vehicle navigationsystem, working off 100% downloadable data developed as part of the ProbeIT project. Thesystem uses a caching strategy in order to optimise the quality of service, bandwidth usage, and to support operation when wireless communication is unavailable. The softwarecomponents and data structures developed are described and discussed together with theadvantages of this approach in relation to other navigation and telematics solutions.
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