Indoor locations are based only on cellphone triangulations, the blue blip expands into a wider crosshair since positional accuracies gives way towards a wider position ambiguities. Once outside, the blips in pinpoint accurate.

It wasnt as long when I had my N95 to get position, the GPS is very fast. When GPS isnt available(you are indoors), the GoogleMaps uses the other two resources, the Skyhook technology from Wifi(extracting position via IP address I presume) and celltower triangulation. Once your under sky cover, the third resource, GPS kicks in.