The IN is a solution for expo centers with the function of a multimedia interactive guide-navigator. The solution solves the problem of indoor positioning, finding a route to the desired object, getting information on objects. The core of the solution is a self-developed unique algorithm that uses sensors of mobile devices and provides a 1,5-meter accuracy which is the highest possible for iBeacons technology. With our solution, we can quickly build client-oriented applications, and to deploy customized solutions on the customer's site, and also brand them if necessary. With the app, visitors can navigate indoors at the event, get multimedia info on objects and premises, use in-app text search. An essential part of the app is a built-in chat where visitors can communicate, make appointment indicating a place on the plan, contact exhibitors. The owner of the system also known as the owner of the expo center gets access to marketing, analytical and logistical information, and opportunities of additional revenue directly and indirectly. We know how to take steps more precisely than fitness bracelets.