**3.1 Inbuilt index**

An inbuilt index was prepared for this investigation for all participants which comprised the name, address, MAC, SSID, picture and mobile number. There were total 90 registered participants. So, inbuilt index included 90 participants for this experiment. An example of the inbuilt index is shown in **Table 1**. The name was used to identify the people by which he/she is familiar in the community. MAC and SSID were be used to build-up the new index in the MPCS for the comparison and detection of missing people. The missing people could be communicated using their mobile number during the search and rescue operation.
