Evade Collision Attack: Control Tower + Special Rudder
Direct Hit Prevention: Control Tower + Mast Top
Watertight Bulkhead: Anti-skid Rope + Hull Bulkhead Plating
Command Post: Control Tower + Admiral's Cabin
Special Smoke Bomb: Special High Explosives + Metal Work
Pre-emptive Attack: Traverse Rope + Mast Top
Improved Gun Port: Admiral's Cabin + Munitions Chambers
Reaction Rudder: Metal Work + Special Rudder