If you look under PIR's you'll find a topic Helpful info from a dad who was just there (Mark) He had this listed there.
-look up the Navy Credit Unions address at the base (Indiana Street) and enter it into your GPS... You'll get perfect directions to the correct gate at the base (there are several gates and if you've never been there, it could be a little confusing).
Hope it helps. Check out his link, he has more information posted if you need anything else.
thanks for the info I found that real easy now lets hope I can find the place when I get back there in a few days .
Also if your kid is staying in Great Lakes for A school you'll have to pick them up at the visitor's center. This is just around the corner from the gates of the graduation. When you're leaving the graduation you'd take a right under the train tracks and follow the road until you hit the light. There you'll take a right and go down past the next light. After the light there will be signs for you to turn right into the parking lot area. The Naval Museum is also located here. It's a nice place to visit while you're waiting on your child to exit since they have to march from their ships to the entrance.
Our son told us to pick him up at the NEX, but lucky for us our taxi driver has been doing this a lot longer than our son :) he took us to the visitor's center to show us exactly where we'd need to pick him up and he also told us to be there by 3pm and that our son would be out by 4pm. We lucked out with our taxi driver :)