The system provides basic and modular tourist information (monuments, restaurants, spectacles, etc), obtained from the local CDROM/DVD that can be extended from the remote server, by a radio connection, when required by the user or the system. This connection allows interactivity, allowing additional actions such as hotel booking, acquisition of localities for spectacles, etc. The mobile system has a hands-free interaction facility by means of an oral interface system in order to preserve the driving security and to increase the comfort. The positioning system allows making optimal calculations of trajectories between streets of a city, giving the driving information from the current point to the destiny one using oral and graphical presentation

As a friendly human-machine interaction is required in mobile communications, SiTio integrates both visual and oral interfaces, so there is no need of using keyboards to make a choice or to command a new order.

SiTio is intended to be used by drivers in vehicles, so it will have special characteristics, mainly in the oral interface. Oral interfaces inside vehicles make necessary a robust speech recognition system. This includes control of background noise and reverberation.

The system mobility and the real-time application create the need of updating information via wireless network. At the moment, a GSM device accomplishes this requirement, but there is no trouble to evolve out of other mobile networks.

SiTio uses Java language for the main modules, and C language for real-time costly applications (such as speech recognition). The program is developed using reusable software components (JAVABEANS). Therefore, you can use them in other Java projects. A main software manager is engaged of coordinating and supervising the interaction of the independent modular JAVABEANS components. The whole software system is modular, which makes easier to change the modules without modifying the basic structure.