For durable markings of big and unmovable work pieces of the ship building industry, a portable handheld marking system means simplification. The handheld marking system FlyMarker PRO of the German company MARKATOR is battery operated and with this very flexible. The dot peen marker weighs slightly over 4 kg and can be easily carried across the shipyard to mark work pieces on site. The control unit is installed in the break-proof housing of the hand-held marking system and is with this protected against external influences, and there are no cables to endanger the work.