Default Nexus indash (vw polo)

Hi,
I have installed nexus gen 1 in my Polo R6 and its working pretty well right now. When I put the key in the tablet starts and turns airplain mod off and wifi on. And when I take the key out and its not putted in again in 15secs the airplain mode goes on, wifi off and force shutdown spotify and Google maps.

There is no acc in vw so to get the tablet on when key is in I have the positiv cabel it via the fusebox. There was one fuse wich has power when I put the key in the lock.

The audio is via a aux connected to Pioneer MVH-X560BT with a rear aux input so I get a clean look.

I have just one problem and would need some ideas, the nexus gps has some problem to the get singnal. So how would you recommend to get better gps singnal?
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Phone: S4 I9505