by Jason Lim, 10/12/2009
The G1 includes an app called "Maps". This app is the Google Maps webpage, but streamlined for a mobile phone. In addition to standard functions like displaying an address on a map, providing step-by-step driving directions, and viewing the map in the bird's eye satellite view, the Maps app can also display where you are (the "My Location" option) on the map. And, if you have your GPS receiver on, your location can be pinpointed to an accuracy of +/- a couple feet.
Here is an on-the-road demonstration of the Maps app, with GPS turned on and the My Location option enabled on my G1. I jump between satellite and map view and perform a route update as we watch the moving blue arrow move, representing my movement on the map.