A mooring was any sort of permanent structure to which a free-moving vehicle might be secured. Piers were perhaps the most common type of mooring. Fitz Kreiner and Compassion, for instance, once noticed airships moored to a stone pier on Yquatine. What he saw of the planet briefly put Fitz in mind of Brighton or Weymouth with their extensive moorings for seagoing vessels. (PROSE: The Fall of Yquatine)