This is meant to find the closest MARTA station to you. I decided to embark on this project because, in my experience, Google Maps doesn't allow one to directly search for the closest MARTA train station and get an accurate result.
Disclaimer: The program behind this page uses the spherical law of cosines to calculate the approximate straight-line distance between the coordinates reported by your browser/device and each MARTA station, then uses that information to find the closest station. In other words, this will get you to a station that is relatively close to you, but it may not be the absolute shortest driving/walking distance from you.