Matek 405 wing no gos

Hi guys I’m new to ardupilot I have setup a 405 wing and got everything working except the GPS keeping saying in his no gps.
I have it connected to serial 3 and rx-tx tx-rx.
Baud rate 38
I have made sure my GPS is working as it works on other boards running inav.

Any input appreciated as I spent all weekend trying to sort it :angry:

Lipo angeschlossen ?

Sorry not understand