An anchor's an object, often made out of metal, that's used to attach a ship to the bottom of a body of water at a specific point. There're two primary classes of anchors—temporary and permanent. A permanent anchor's often called a mooring, and's rarely moved; it's quite possible the vessel can't hoist it aboard but must hire a service to move or maintain it. Vessels carry one or more temporary anchors which may be of different designs and weights. A sea anchor's a related device used whe… (More on Anchor)