If you start the driving mode you´l be asked to enter a rough direction. We send this city to our server and calculate a route a heavy truck can drive. After that we select the parkings with some special algorithms.
If you leave our pre-calculated route because you know better what is the best way or there is a traffic jam or blocking the app will make a new routing (re-routing) and send your new position to our servers. After that we are calculating a new route, selecting the parkings on the road and send it back to your device. The whole re-routing need 5-8 seconds and you shouldn´t notice this while you´re driving.