Unit module (S)

The Unit module (S) is a small Cargo Dock module used to handle unit-product cargo, specifically the Sawmill’s output. After the module is built, its cargo type must normally be chosen in the module UI, but because there is only one unit product cargo available, it is automatically selected once the Sawmill has been discovered, repaired, and staffed with workers.

Unit modules on the same Cargo Dock can be configured independently, and even different module types can be mixed on the same dock if desired. In practice, modules that share a dock are often built in matching pairs to make Cargo ship management simpler. This matters because a Cargo Ship will remain idle for months if it is not fully unloaded before departing, so mixing cargo types can cause the ship to wait on a slower-moving cargo line while a more active line is already short on capacity.

The module’s effective transport capacity is best understood in relation to the Sawmill’s production rate and the Cargo Ship’s round trip time. Using the average throughput of 32.1 units per 60 seconds once travel time is included, the following comparisons apply:

• One small Cargo Dock module can continuously exceed the output of a 1-shift outpost at an 84.1% duty cycle.
• Two small Cargo Dock modules can continuously exceed the output of a 2-shift outpost at an 84.1% duty cycle.
• Three small Cargo Dock modules can continuously exceed the output of a 3-shift outpost at an 84.1% duty cycle.

Because of this, the Unit module (S) is mainly a logistics solution for steady Sawmill export rather than a bottleneck on production itself. Its usefulness increases when the cargo stream is kept simple and consistent, since uniform module setups reduce the chance of partially loaded ships and the resulting throughput loss.