Services which are considered of special interest to the navigation business, that can be delivered by the port administration, through its staff or equipment. They are, for instance: checking weight; removal of volumes; opening of volumes for inspection; weighting of comodities again; marking and remarking volumes; stacking or arrangement of goods in storage rooms; additional loading operation, or unloading of waggons or other vehicles foreign to the port, in the port premisses; energy supply to boats or consumer instaled in port premisses etc.