A lot of people have gone away from the HDS5 for off road. While the HD units are great GPS they are not really that great in anything smaller than a 7-10". The 5" screen is really hard to read. I would recommend looming at the Lowrance Baja Elite 5M. It's a solid unit made for marine and off road use. It has an intrn antenna and also comes with an external remote mount puck style antenna. I highly recommend it.