If you have a GPS-enabled device, this blue dot corresponds
to your GPS location. At times, or if you do not have a GPS-enabled
phone, you might see the blue dot surrounded by a light blue circle
(as shown on the right) to indicate uncertainty about your location.
Why the uncertainty? The My Location feature takes information
broadcast from mobile towers near you to approximate your current
location on the map - it's not GPS, but it comes pretty close
(approximately 1000m close, on average). We're still in beta,
but we're excited to launch this feature and are constantly
working to improve our coverage and accuracy.
The My Location feature is available for most web-enabled mobile phones,
including Java, BlackBerry, Windows Mobile, and Nokia/Symbian devices.