Google Nexus One User Manual page 223

Maps
The map centers on a blue dot that indicates your location. A blue circle around
the dot indicates that your actual location is within the circle.
To move the map
S Drag the map with your finger.
To zoom in and out of a map
Touch the plus or minus side of the Zoom control
S
OR
S Double-tap a location on the map to zoom in to that location.
OR
S Touch an area with two fingers at once and pinch them together or spread them
apart, to zoom out or in.
Not all magnification levels are available for all locations.
To clear the map
After you get directions or search on a map, you can clear the markers that such
activities draw.
S While viewing a map, press Menu
NOUG-2.1-update1-105
Drag the map to move in any direction.
Your location.
Zoom in or out.
and touch More > Clear map.
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Nexus One User's Guide