Add a new rule, “Ports”:

Each Captain may have a Home Port, which is tracked in the GNDT as “Port”. If a Captain has no Home Port, they may choose their Home Port to be any square from the Chart that is all of:
* Not already the Home Port of a Captain
* On the edge of the Chart, or adjacent to a square that is on the edge of the Chart
* Not adjacent to a square that is in a different quadrant
* In the North West quadrant if the Captain’s Side is Blue; in the North East quadrant if the Captain’s Side is Green; or in the South West quadrant if the Captain’s Side is Red.

In “The Watch”, replace

Add a Battleship or Submarine under their control to a grid square of their choice and with a facing of their choice (unless the Captain giving this Order already controls a Vessel).”

with

Add a Battleship or Submarine under their control to their Home Port with a facing of their choice (unless the Captain giving this Order already controls a Vessel).”