What is a key feature of the pilot's ladder?

A key feature of the pilot's ladder is that it is constructed of metal, which contributes to its strength and durability. The use of metal allows the ladder to withstand the harsh marine environment, ensuring safety and reliability when pilots are boarding or leaving a vessel. The materials used in the construction are specifically chosen to provide stability and prevent corrosion, making them suitable for repeated use in various weather conditions.

While the other options mention various aspects of the ladder, they do not accurately describe its primary characteristic. For instance, a pilot's ladder is not limited to emergency use; it serves as a standard means for pilots to board vessels safely. Additionally, it is typically not permanently attached to the ship, as it must be deployed and retracted as needed. Likewise, it is not generally carried by crew members in the sense of being a personal item, but rather stored on the vessel for use when needed. The metal construction stands out as its defining feature, highlighting its capability and suitability for the intended function in maritime operations.