Does anyone know how to change the preset radio stations? I don't have the owners manual. When I press the audio button, the navigation screen with 6 preset stations show up. There is no option for me to delete or edit those station number. And yes, I did try to tune in to my desired station and try to hold the station preset# on screen. It will not allow me to change the preset memory.

Have you tried tuning in to the desired station and then pressing and holding the required preset button? Thats how most car stereo's work although I haven't seen a GS.

Sounds like the touch screen may be faulty - does it work OK on the Nav??