This is a very interesting issue I seem to have run into. Since getting the Samsung Infuse 4g in August I decided to modify my car entertainment system to be able to take the HDMI signal from my phone and have it display on car TVscreen. Except one small glitch....Infuse GPS signal cuts off once HDMI cable is plugged in. I tried to plug it into my regular TV at home and the same thing with GPS happens. I called Samsung support and they said that for now there is no clear work around this. And they weren't sure if it's a hardware or software limitations. Any suggestions?