I was wondering if there is anyway to set up the BB 8800 so the backlight stays on while I have the car battery charger hooked up and I am using the GPS system? The system goes dark on long stretches of road and I must constantly reach out to hit a button if I want to look at the map. Any ideas? If I have the BB on external power I would be happy to have an option to leave the backlight on so I do not have to constantly activate the light.