Abstract: A vertically varying nautical mooring device for automatically adjusting the vertical positioning of a floating vessel relative to a rise or fall in the local water level. The devices provide a vertically adjusting mooring device for a floating vessel comprising a pair of horizontally extending attachment brackets for supporting at least one elongated vertical support shaft at some distance from a support structure (such as a piling) wherein the support shaft is suspended in a vertical orientation between the attachment brackets and wherein a generally toroidally and symmetrically shaped slide which fits about the elongated vertical support shaft such that the slide is able to rotate about and move vertically along the elongated vertical support shaft.