Nokia N800 - Manual (Page 45)

Positioning
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To start navigation, tap the arrow icon on the right side of
the display, select
Find route from the menu, and enter the
destination similarly to finding a location. When a GPS
signal is available, your current location is automatically
used as the point of origin for navigation. Otherwise, the
map application asks you to provide the point of origin.
To change navigation related settings, like routing options
and voice guidance, tap
on the navigation menu.
To return to map view, tap in the top right corner of the
navigation view.