One problem is that I did not think about the need for a map before doing the measurements. So I do not have coordinates for each point. But I think that the speed of the car was constant enough to allow me to say that the messurments were taken a fixed distance from each other. So to get coordinates my idea was to find the coordinates of the path and get som function that gives a value after some time to give the value at each point. The other way I see is the extract 300 coordinates from the list of the path and plot those but it seems more wrong.