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...of the space depicted by a map in order to provide a useful tool for that user. ...puterised maps with route-planning and advice facilities which monitor the user's position with the help of satellites.

...y pivot to align itself with the magnetic field. It is then labeled so the user can distinguish the north-pointing from the south-pointing end; in modern c

...segments. These are the space segment (SS), a control segment (CS), and a user segment (US).<ref>globalsecurity.org [http://www.globalsecurity.org/space/s ==== User segment ====