I'm one of the developers of the iOS app Tracku. It is the only application that could show an unlimited people's location on a map. We also have a shared pin feature that allows users to share geographical locations of interest.<p>We are used in a tourism business in Florida where tour guides use it to track each other to prevent jetski collection in narrow woods.<p>It is this morning that it came to struck me that maybe our app could be used to help someone in Japan since it's a proven app and it seems that the internet is still working in Japan (obviously a guy kept playing an online fps game during the earthquake).<p>However we don't know in what way the app could be used or how do we let people in Japan know. Can some one shed a light?<p>The app is at http://www.trackuapp.com. It has a free version but we will be making the paid version free just so that everyone in Japan can use it if it actually helps.