Diagram of a boat with anchors in bow and stern, keeping a fixed orientation
<a href="//commons.wikimedia.org/w/index.php?title=User:Tobixen&amp;action=edit&amp;redlink=1" class="new" title="User:Tobixen (page does not exist)">Tobixen</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>