Interesting concept. If you haven't found it, it's at
http://www.nav4all.com/site2/www.nav.../eng/index.php (english..they support many languages)
Does look like it would have US applicability, but it doesn't seem to support any Smartphones. It appears you load an application and all the maps, screens are loaded over the air. You can use a GPS to do what those typically do. Right now it is free, but they are very upfront about trying to get you hooked, so when they do start charging
