This project processes a dataset of NYC subway entrances which has almost all entrances of subway stations in NYC. It will allow user to obtain information about selected aspects of data, such as which route is the nearest from a GPS point entered by an user, which entrance is the closest from the entered point, or which entrance is connected to an arbitral route, where two stations are connected if they have free transfer meaning station has same set of routes and the distance between them is less than 0.28km.