**Abstract**

The mobility handicapped, especially the visually impaired, are complaining of many difficulties and inconveniences in moving in underground spaces such as subway stations due to inconvenience in behavior and lack of guidance information. Route guidance for the visually impaired through various mobile apps using the newest global positioning system (GPS) is supported, but these apps cannot be used in areas where GPS signals are not received. To solve this problem, in this chapter, an Internet of things (IoT) sensor-based route guidance technology was presented to improve the mobility of the visually impaired in indoor areas such as railway stations and a mobile app has been developed, where an IoT-sensor-based user positioning algorithm and user convenience are considered. In addition, to evaluate the applicability of the developed system, the user satisfaction was measured through a test at the virtual Busan City Hall metro station for the visually impaired. The route guidance technology presented in this chapter is expected to contribute greatly to the improvement in the mobility of the visually impaired in indoor areas including railway stations.

**Keywords:** the visually impaired, route guidance, IoT-based technology, satisfaction ratio, positioning algorithm in indoor area
