Shipyard

 is where you trade your ship in exchange for another.

You can only find a  when you are docked at Ports. You can see if a port has one by looking for an active Shipyard tab in your Gazetteer and clicking on it.

Available shipyards
At the start of the game, if you want to trade your ship, the London , called the Drydock, is the only one available for that purpose.

After getting the reward from The First Curator in Venderbight, the  there becomes available.