You need Internet to build routes you want to navigate. You can then save them without Internet and drive offline.
That means, you can prepare for the journey at home, accessing Internet from your device through home Wi-Fi — build routes, save them in the app and take the smartphone with you. In your car you'll need no more Internet connection to drive the routes you've saved in Hudway — just access My Routes section in the left-side menu.
Please note that HUDWAY has no offline route calculation — thus, if you change the route you're driving, Hudway won't be able to help you build a new one without Internet connection. We're working on that, though.