TIS-B is a surveillance service aimed to improve pilot's in-flight awareness of the nearby traffic. It provides for display of both broadcasted by appropriately equipped aircraft identity, position, altitude, speed (and other parameters) and surveillance tracks processed by regional control facilities and transmitted by ground broadcast stations. In order to benefit of this service users have to be equipped with pertinent ADS-B In & Out devices. The users of TIS-B include airborne aircraft, aircraft operating on an airport service, and a select set of airport surface vehicles.