Unlike in older Nokia phones that I have user(Nokia E71 and E52), GPS in Nokia Lumia is SUBSTANDARD and HORRIBLE. I had to drop my wife from my house to New Delhi Railway Station around 4am. We followed Nokia Lumia 800 GPS, and it returned us BACK to our home from half way! This happened AGAIN when I wanted to go from my home to Jangpure Extension - GPS made us turn half way through some alternative route and made us return back home from half-way!
I learned from a mobile shop store shop in Delhi, that GPS in new Nokia phones is sub-standard and is "Assisted GPS", instead of "a GPS device".