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Indoor user localization and tracking techniques and systems are instrumental to a broad range of services and applications that are supported by advanced wireless networks, sensors and Internet of Things (IoT). Applications utilizing localization information can assist people in shopping malls, through the provision of navigation services and geospatial marketing alerts; in hospitals, for monitoring the location of patients, doctors and critical equipment; in logistics, for tracking assets and optimizing empty spaces in ports or inland storage, even in homes or for providing relevant Ambient Assisted Living (AAL) services. Since Global Navigation Satellite System (GNSS) signals are not available in indoor environments, localization can be typically achieved by utilizing other off-the-shelf wireless communication technologies (Wi-Fi, Bluetooth, LTE, Zigbee, VLC etc.). Striving for accuracy, the research community investigates sophisticated solutions that are often sought through hybrid approaches. It is a fact that the accuracy achieved by any Real Time Localization System (RTLS) is affected by the volume and quality of information that is available during the position estimation procedure. The more useful information can be provided, the higher the probability of producing a more accurate estimate. Depending on the capabilities of the terminal or the overall RTLS, in retrieving, storing and processing location-specific information, advanced positioning algorithms can be developed in order to provide improved positioning services. The location-specific information may include radio parameters retrieved by one or more wireless technologies, such as …