Mr. Wong Ka Fai, who is at his second year of study of the MPhil-PhD degree in Mathematics, paired up with a postgraduate student from HKUST and has developed a mobile application named "NavDog" to support visually impaired people. With the seamless hybrid indoor and outdoor positioning technology, real-time navigation instruction, and instant alerting feedback system installed in NavDog, visually impaired people can now travel to anywhere safely, with confidence, and without barriers in both indoors and outdoors.