Perlu diingatkan bahawa panjangrantai sauhtidak boleh dikira dalam meter, tetapi dalam nod yang paling biasa digunakan dalam navigasi. Panjang setiap bahagian rantai sauh laut adalah kira-kira 27.5 meter. Ia adalah perlu untuk menerangkan bagaimana unit ini wujud.
Panjang pic rantai sauh adalah berbeza daripada pic unit kelajuan yang digunakan dalam navigasi. Ia sebenarnya berasal daripada unit bahasa Inggeris, fathoms. Panjang satu depa adalah kira-kira 1.8288 meter. Kerana Empayar British kuat dalam pelayaran, ia kemudiannya menjadi standard antarabangsa. Kemudian, ia ditetapkan secara seragam bahawa panjang rantai sauh ialah 27.5 meter. Dalam penggunaan sebenar, setiap bahagian rantai sauh terdiri daripada belenggu, dan bahagian itu disambungkan dengan pautan boleh tanggal. Secara amnya, pautan rantai akan disembur putih, supaya krew dapat mengetahui berapa banyak rantai sauh telah dilancarkan.
The last section of the chain is usually sprayed red to warn the crew that they have reached the end of the chain. Generally, the anchor chain is fixed on the chain reel. If the ship has not finished decelerating before it is released, the anchor chain is likely to break and fly out of the ship. To prevent this, the last but one section of the anchor chain is usually sprayed yellow, similar to the use of traffic lights.
According to international practice, each anchor chain of a large commercial ship usually has only 12 to 13 knots, and the length is between 330m and 357.5m. However, this is only a vague standard value. Specific to a ship, it needs to be determined according to the outfitting number of the ship. The calculation method of outfitting number is very complex, so we won't repeat it here. We just need to understand that if the outfitting number of a ship is larger, it means that the ship is more affected by wind and waves at sea, so it needs to be equipped with heavier anchors, thicker anchor chains and ropes. Generally speaking, the outfitting number of warships is higher than that of ordinary freighters, but it is not suitable to lengthen the anchor chain after reaching 13 knots. Because it will prolong the anchor receiving time, the anchor chain needs to be thickened, or even more than one anchor chain to ensure stability.
