The accuracy can be improved by placing an invisible 10 kph speed sign on the ship track at the centre of the loader.

• 其精确度可以提高放置在一个不可见的装载机中心10公里的轨道上高速船舶标志。The ship slows when the bow of the ship reaches the speed sign； and will stop correctly at the unloader.；该船减速时，该船船头的速度到达的迹象，将停在卸船机正确。