The best way to check JCV is simulate route. When press the top screen tape in center on map page. You can see list of manures on route. Press any of it and then scroll list with arrow. On the center of bottom tape you can see button "Scheme". If it is grey so it is no JCV image on route. If it have white color of text you can press to this button and see JCV. Notice that if you will be passed junction without changing of mainstream lane so there are not JCV for showing even if it is present on map.
Try several complicated routes with this methods and report please. It is five minutes deal. When device ask you for simulation on route after calculation you may to say NO.