"In the area of Location Based Services (LBS), smartphone-based positioning applications are built on positioning data mainly provided by GPS, which in many cases may become problematic due to the low accuracy provided (thus preventing the take-up of services with high accuracy constraints) and the non-availability of confidence-level in the positioning information, the so-called integrity.GNSS Augmentation Systems like WAAS (in United States), MSAS (in Japan) and EGNOS (in Europe) have been a consistent attempt to overcome these GNSS problems and improve the positioning applications attributes, such as accuracy and reliability. These systems have reached today a quite mature state, nevertheless related technology and algorithms on the applications side have been certified and used with efficiency only in niche areas like the air navigation systems.However, still the significant technological know-how of embedding EGNOS functionality in positioning applications, has prevented European SMEs, developing location based applications for smartphones, from adopting these new technological opportunities, thus not getting them in a position to be able to exploit the accuracy and the confidence in positioning information offered by EGNOS (and future GALILEO) in their applications. This will be possible when commercial EGNOS/GALILEO chipsets will be available for smartphones, but today this is not the case.POSTO aims to provide a viable solution to the aforementioned problems, by supplying the methodology and the software libraries required for the design and development of GALILEO/EGNOS-based mobile positioning applications, targeting SMEs who are seeking to develop positioning applications for smartphones by exploiting the full potential of the GALILEO/EGNOS benefits."