I have not tried this myself, no intention too either (one, am quite happy with my TomTom and two, maps are only for the US), but Moving Gmap adds moving map functionality for Google Maps using a connected GPS unit. (It makes the map recenter on you as you walk/drive around). If someone tries it out let me know how it goes.
Also, in case you did not notice then Google maps now have satellite views, I know for a fact that they don’t cover all the areas the satellite view (yet). If you are interested, I use to live here till a few months ago before moving to London.