The most basic condition for the anchor chain to work is to hook things on the seabed. If the chain is not long enough, the anchor will not work. If the bottom of the sea is flat, or the thing hooked by the anchor is not fixed, or the hook is not very firm, it is OK if it is calm. Once the sea is too large, the anchor will lose its function. This is called "anchor walking". It is very dangerous for the ship to go anchor during anchoring, because the main engine of the ship usually stops when anchoring, If the ship starts immediately, it will take time. It is very dangerous for a ship without power to float around. Therefore, we have the concept of anchorage. Anchorage, by implication, is rough under the seabed. In addition, we should be able to take shelter from the wind.(anchor chain)
