Google Nexus One User Manual page 237

Maps
S Touch the navigation icon
To get an alternate route to your destination
If traffic is slow on your current route, or if you just want to try a different route, you
can request an alternate route from the Google Maps Navigation service.
1 Press Menu
2 Touch the alternate route icon
An alternate route is drawn on the map.
To exit navigation
You can exit Navigation View when you reach your destination, or at any time.
S Press Menu
You return to the previous Maps view.
NOUG-2.1-update1-105
to return to your current location in Navigation View.
and touch Route Info.
.
and touch Exit Navigation.
237
Nexus One User's Guide