This study aims to construct a visualization method for understanding the effects of a helicopter emergency medical service. The effects will be calculated for the time that elapses before medical action is initiated. To calculate the elapsed time, the distance between each points will be measured using a geographic information system while considering geographical factors. The effects will also be investigated from visual and quantitative perspectives while considering the population of the study area. The proposed method will be examined from the viewpoints of the rendezvous point and emergency hospital acting as helicopter bases.