I think what sets this apart from sites like Loopt, Gowalla and Foursquare is that those sites are oriented towards the social networking aspect of geolocation. Those sites are community based where as this seems more like a nice little utility app for giving someone directions. The real time tracking and simplicity is what makes this unique I think. Not sure where these guys are going to take this but I would urge them to not turn it into a another geo-community to find new "friends" and "places".