This article is about the Building, see Trading Dock(research) to view the article about the research.
The Trading Dock is a building that enables Quick Trade with neighboring islands. Examples include trading Construction Parts to receive Potato, Wood for Concrete Slab, and Coal for Diesel. Each trade spends a small amount of Unity.
Making the same trade multiple times in rapid succession will cause raising their prices temporarily, and trading much more causes being sold out for a while.
Like the Captain's Office, the Trading Dock is a unique building, and only one may be built on the island. But it can be moved by deconstruction and replacement.