Being in the right place creates a lot of business opportunities. This is because different services can be provided depending on where you are. This is called location-based services (LBS). It requires technologies on localization (knowing one's position), tracking (learning one's position over time), and navigation (guiding one from one place to another). Despite of much success of outdoor LBS based on Global Positioning System (GPS), LBS is still in its infancy.
Your mobile phone will answer these questions for you: Where am I? What is around me? How can I get there? It will be fun to let your mobiles to guide you around.