To pass under the bridges which cross the canals and rivers of Burgundy, it is important to know the water draft (height of the submerged part) and the air draft (height of the superstructures located above the waterline) of the boat being sailed on, as well as the height of the bridge and the level of the watercourse. These concerns are dispensed with The pleasure boaters are luckily exempted from such concerns since they rent cruise boats with dimensions adapted to the arrangements of the waterways they are authorized to use.