If a rule called “Fire Control” exists, make the following changes to that rule:

Replace the text:

“Vessels which are Armed can Shoot; Armed Vessels can Shoot a distance, measured in squares, from a square adjacent to the square they are located in.”

with the text:

“Vessels which are Armed can Shoot; the distance an Armed Vessel can Shoot is called the Range. Range is measured in squares, from a square adjacent to the square the Shooting Vessel is located in, to the square it is Shooting.”

After the text:

“a Battleship can choose to shoot at the same square twice.”

add the text:

“Battleships Shoot a Manhattan distance.”

Replace the text:

“this square must be between the Submarine and the grid edge the Submarine is Facing”

with the text:

“this square must be from a single row (if the Submarine is Facing East (E) or West (W)) or column (if the Submarine is Facing North (N) or South (S)) which is directly between the Submarine and the grid edge the Submarine is Facing.

Create a rule called “Armour Value and Damage”

Vessels have an Armour Value. A Vessel’s Armour Value decreases when the Vessel suffers Damage. Shots cause Damage.

Battleships have an Armour Value of 6; Submarines have an Armour Value of 3.

Shells Shot by Battleships, and Torpedoes Shot by The Submarine decrease the Armour Value of Vessels they hit by 1.

If, when the Admiral has updated the Chart, a Vessel is in the same square as a Shot, that Vessel suffers Damage.

If a Vessel’s Armour Value is reduced to 0 it Sinks. A Vessel which Sinks is removed from the Chart at the next Chart Update.