What is a marina coil?

A marina coil, often referred to in the context of a marina or boat dock, typically refers to a type of mooring or anchoring system used to secure boats in place. It can also describe a specific type of coil or spring mechanism used in marine equipment to assist with docking or securing vessels. The design aims to provide stability and safety for boats while they are docked. If you're referring to a different context, please provide more details.