Remember there is a LOT of construction going on at the 316/85 exit. I would HIGHLY recommend the following directions :

Take 85 North to Indian Trail

Make a LEFT onto Indian Trail and go to the 2nd light - Beaver Ruin Rd.

Make a RIGHT on Beaver Ruin.

Go to the 2nd or 3rd light, it is for SATELLITE BLVD ,it will have 2 left turn lanes.

Make a LEFT onto SATELLITE BLVD.

Stay on Satellite until you PASS GWINNETT PLACE MALL

From there you can either make a right on BOGGS RD or HWY 120/Duluth Hwy to get to 85 NORTH.

When i went to the Walter Mitty 2 weekends ago, traffic on 85 N was HORRABLE, this detour will be much faster.