It works... I just tried it. The app apparently thinks the device is an iPod Touch as it displays this message on launch, "Connect to GPS To enable route guidance you need to connect your iPod to an accessory GPS device. We recommend the TomTom car kit." Hit continue and go. I cannot say whether or not the data plan is required... I have it. And it is snappy for sure. Looks ok at double size. Maybe I'll duct tape the iPad to my steering wheel?