Navigation system has server with route planning module, mobile radio device, portable expansion unit with positioning module, route control module that outputs navigation information

摘要

The system has at least one server with a route planning module, a mobile radio device (8) for transmitting a route request and position data to the server and receiving a planned route, a portable expansion unit (8) for modular connection to the mobile radio device with a positioning module and a route control module that uses the received route and updated position data to output the navigation information to the user. Independent claims are also included for the following: a portable expansion device for reversible connection to a mobile radio device to form a modular navigation device and a method of outputting navigation information to a user.