This is a server side application which handles Locate(see Locate repository readme) android app which send gps location at a regular intervel. This data are then collected and plotted on a Google map.
See a trip from howrah junction to tatanagar - https://locate123.herokuapp.com/getpath/[email protected]/D/
With these data many usefull results can be extracted like current location, path, time, distance, average speed.