Abstract: Mobility of visually impaired people is restricted by their incapability to recognize their surroundings.  According to the World Health Organization (WHO) in 2012,  out of 7 billion global population  there were  over 285 million visually impaired people and 39 million were totally blind out of which 19 million are children ( below 15 years). This means that someone in our world goes blind in every five seconds and a child in every minute. Over 90 percent blind children obtain no schooling. Recent survey source India is now became the world’s large number of blind people. The population of India has reached 120 Cr. of those 8.90 Cr. people are visually impaired. 90%of those cannot travel independently.  In this paper, we present a survey of navigation system of visually impaired people highlighting various technologies with their practical usefulness, design and working challenges and requirements of blind people. The aim of this paper is to provide a better understanding to identify important research directions in this increasingly important social area for future research.


Keywords: Navigation system, visually impaired, obstacle detection, mobility, localization, indoor navigation, outdoor navigation, GPS, RFID, ultrasonic sensor