IHW: Pigboats - Alterations to the Boats

While the crew are relaxing and recuperating between mission, the submarine itself may be modified. Some modifications are ordered by the Navy, and are called Mandated Modifications. Others are initiated by the sub’s skipper, and are called Optional Modifications. Mandated Mods are free, and required. Optional Mods are given as favors by the yard to successful skippers. Skippers gain mod points for tonnage sunk, successful clandestine missions, shore bombardments, rescues, lifeguard duty, and other successful missions.
Mod Point Table

Mission Awarded For Mod Points
All Patrols Per Mission 1
Per 2000 Merchant Tons Sunk 1
Per Escort/Submarine Sunk 2
Per Cruiser/Battleship Sunk 3
Per Carrier Sunk 4
Per Barge Sunk 1
Per Totally Ballsy Move* 1
Per Clean Sweep** 3
Clandestine Per Mission 1
Per Insertion 1
Per Rescue 2
Per Crew Incursion*** 2
Lifeguard Per Mission 1
Per Rescue 2
Radar Picket Per Mission 1
Per Kamikazi Intercepted**** 2
Other Per Shore Bombardment 1
Per Special Mission 3

* Like sinking ships in a harbor, and other hairy escapades.
** Sinking all the merchant ships in a convoy.
*** Like landing and blowing things up.
**** Detected and shot down before hitting a ship

Mandated Modifications

Date Range Modification
Early 1942 Cut Down Cigarette Deck
Late 1942 Remove Plating on Periscope Shears, Cut Down Bridge Silhouette
Early 1943 Installation of SD RADAR
Mid 1943 Additional Limber Holes for Faster Diving - Half the Time.
Early 1944 Installation of SJ RADAR
Mid 1944 Installation of ST (Periscope Mounted Range Only) RADAR
Early 1945 Installation of SV RADAR

Optional Modifications

Date Mod Available Mod Mod Point Cost
1942 Swap Light AA for Dual Light AA 2
1943 Swap Light AA for Med AA 3
1943 Swap Med AA for Dual Med AA 3
1943 Swap Dual Med AA for Quad Medium AA 4
1944 Swap Med AA for Heavy AA 4
1944 Swap Heavy AA for DualHeavy AA 4
1944 Swap 3 inch deck gun for 4 inch deck gun 5
1944 Swap 4 inch deck gun for 5 inch deck gun 6
1944 Swap 3 inch deck gun for 5 inch deck gun 7
1945 Add second 3 inch deck gun 10
1945 Add second 4 inch deck gun 15
1945 Add second 5 inch deck gun 20