 Recently, with the rise in popularity of in-dash DVD players and GPS navigation systems which aid in justifying the expense of adding a color LCD to the driver's seat, they have become much more common, often available as optional factory accessories on standard passenger trucks and sport utility vehicles, as well as aftermarket accessories.Inside the vehicle, the display is typically wired to automatically sense when the transmission is set in reverse, showing the backup view while in reverse and or providing grid guidelines by detecting the parking lot markings to aid the driver.The display will show the map (or other content) on the screen at all other times typically in other gear modes in most parking systems.