Bangladesh Humanitarian OpenStreet Operation Team (BHOOT) mainly conducts various humanitarian activities. As usual BHOOT Team has adopted a project for increasing public health service facilities. The aim of this project is to ensure public health through providing GPS location with full address of every individual health service centre of some congested area of Dhaka City. A number of volunteers were engaged in this project for collecting field data. The volunteers collected data through mobile devices using ODK and OsmAnd. They collected data with exact GPS location, capture image and full address of different health service centres such as Medical hospital, Diagnostic centre,Homeo Centre, Therapy centre, dental care,Eye care pharmacy and so on. When these data used on map and publicly opened,people can easily find different health service centre around them. Using this data we can find out whether these health service centres are sufficient for the residence of the area or not and we can also predict the conditions of the health facilities of the entire Dhaka city. The Health Ministry and various NGO’s can go ahead getting the ideas from this project to ensure public health service facilities for the congested city dwellers.