Initially, Google Maps opens with a street map. You can view additional map layers,
such as satellite images, traffic information, your Google Latitude friends’
locations, and Wikipedia information on locations. You can also view maps that you
and other people have created in Google Maps on the web. You can view multiple
layers at the same time.
Not all locations have information to support all Map layers or all zoom levels.
To learn more about layers, visit Google Maps on the web: http://maps.google.com/