All Emirates flights in DXB arrive and depart from Terminal 3 which airside consists of Concourses A, B and C. You won't know in advance where you'll arrive, but an IFE channel should be able to tell you where you'll depart from about an hour or so before arrival. If it doesn't you'll need to look for the screens once in DXB. All 3 concourses are connected airside either on foot or by train (A to B).

I suspect Google has dug up an old map or some other misinformation.