An instrument defining instruments proximal and distal ends and positionable with respect to a body valve in the body of a living subject for implanting anchors into living tissue at a predetermined location relative to the body valve. The instrument includes a body. A movement sensor and an effective portion including an anchor implanting mechanism are mounted to the instrument body in the instrument distal end section in a predetermined positional relationship relative to each other. The effective portion positioner is mounted to the instrument body in the instrument proximal end section.
