Lots of people complaining about this here.
http://www.google.com/support/forum/...214fbeab&hl=en
It seems that it did exist on google mobile maps and then they removed it. I smell a rat here. I think this is something that can be bought as a feature on a smart phone and they don't want people getting it for free. Similar to the free sat nav on iPhone issue which would mean no-one would ever buy TomTom etc