A privacy enhancement device for electronic device such as a cellular telephone. The privacy enhancement device may include a jammer which may produces false information, e.g. false information indicative of pseudo ranges. In addition, the navigation information used on the position detecting device may be locally stored versions of dynamically changing information. The navigation operation may be carried out using a Web service.

 
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< Vehicle display apparatus

> Recording medium having data structure for managing reproduction of data streams recorded thereon and recording and reproducing methods and apparatuses

> Recording medium having data structure for managing reproduction of data streams recorded thereon and recording and reproducing methods and apparatuses

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