Don't wait. Get this app NOW.
I've had this app for almost 20 years. Pretty sure it was the first app I ever paid for, on an iPod Touch around '07/'08. The description says it all. Don't wait. This is $4 VERY well spent. I'm a native NYer, but no one knows exactly where to stand for every possible exit at every station. Now you can. If you care about maximizing the efficiency of your commute, download this immediately. Honestly, they can/should charge more.