To change the language on the navigation system (commonly found in SEAT and Volkswagen vehicles), you primarily use the "Setup" menu or physical control buttons to navigate the system interface. Quick Guide to Changing Language on RNS 300 Enter Setup : Press the button on the physical unit faceplate. Navigate to Language right-hand rotary knob
Here is a report outlining the methods to change the language on an RNS 300 unit. how+on+rns+300+change+language+new