Abstract: Now-a-days crimes are getting worse day by day especially when itís comes to women and children. Nobody feels safe while travelling alone and mainly to beat abandoned place. However, we recognize that there is need to provide necessary system/devices to overcome these issues. Various applications and algorithm are proposed to overcome these issue by providing the android app to user like Abhaya, Raksha, and Fight back through which user can tap the button on app whenever they feel vulnerable at public place or when the need arises. These system uses GPS for tracing the location and these app can send the real time and continuous location of the user. Several algorithm are developed to enhance the location accuracy. All these devices has result in the reduction of crime and improve the human safety. The objective of this survey paper is to propose a system through which a vulnerable user can get help instantly.

Keywords: GPS, GSM, Location, Latitude, Longitude.