#ground_tackle__anchor  a mechanical device that prevents a vessel from moving
  supertype:  #hook.mechanical_device__claw  a mechanical device that is curved or bent to suspend or hold or pull something
  part:  #fluke.projection  #shank.cylinder
  part of:  #vessel.craft
  subtype:  #grapnel_anchor__grapnelanchor__grapnel  a light anchor for small boats
  subtype:  #mooring_anchor__mooringanchor  an anchor used to hold a mooring buoy or a channel marker in place
  subtype:  #mushroom_anchor  an anchor used for semipermanent moorings; has a bowl-shaped head that will dig in however it falls
  subtype:  #sheet_anchor__sheetanchor__waist_anchor__waistanchor  spare anchor for use in emergency

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