The present invention provides an apparatus for advancing an endotracheal tube through and along the length a patient’s larynx with a laryngeal mask airway in place and without interrupting ventilation. An intermediate member is connectable to a transom mount structure having a connector adapted for mounts with central axes generally perpendicular to a plane of symmetry of the marine vessel. Each of the evaluation devices respectively has a separate power supply system and transmitter between them, only a single display device being provided on the toe binding or on the heel binding, in particular a display with graphic capability, in order to display the respective values or states of the toe and heel binding. The covering material includes an opaque dye that bonds with the polyurethane foam that is poured into a mold with deionized water for solidification.