How do you calculate turning circle for vessels at anchor?

To calculate the turning circle for vessels at anchor, you first determine the vessel's length and the distance from the pivot point (usually near the center of the vessel) to the bow and stern. The turning radius can be estimated using the formula: Turning Radius = (Length of Vessel / 2) + Drag Distance, where the drag distance accounts for the effects of wind and current. By plotting the turning circle on a nautical chart, you can visualize the area the vessel would occupy while turning, considering these external forces.