The present disclosure relates to a gangway that includes a distal end to which an end effector unit is attached. The end effector unit has an outer surface in at least one specific area applied to contact the installation, and when the end effector unit contacts the installation, movement of the rotatable element within the end effector unit is a reference point on the installation. Corresponds to the movement of the distal end relative to, the distal movement along at least one of the axes associated with the fixture. The present disclosure also relates to a method of relocating a gangway to a desired location on a facility or target structure. The present disclosure also includes ships or watercraft including gangways; And gangways. The present disclosures also relate to a computer software product implementing any of the method steps disclosed herein.
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