Naval Support

All 43 Naval Support research technologies from HOI4 v1.19 — real costs, years, prerequisites and unlocks mined from the game files.

Naval Support technologies (43 entries)
Tech	Cost	Year	Prerequisites	Leads to	Unlocks	Effects
`Naval Gunnery` basic_battery Has a scripted effect on completion.	1	1922	—	Basic Light Battery, Basic Heavy Battery	Modules: `ship_light_battery_1`, `ship_medium_battery_1`, `ship_light_medium_battery_1`, `ship_heavy_battery_1`, `ship_secondaries_1`	—
`Contact Mine` basic_naval_mines	2	1922	—	Magnetic Mine, Minelaying Submarine	Modules: `ship_mine_layer_1`, `ship_mine_sweeper_1`	—
`Basic Torpedo` basic_torpedo Has a scripted effect on completion.	2	1922	—	Improved Ship Torpedo Launcher	Modules: `ship_torpedo_1`, `ship_torpedo_sub_1`	—
`Fire Fighting Drills` damage_control_1	2.5	undefined	—	Separate Fire Mains	—	Critical Receive Chance -0.1 Naval Critical Effect Factor -0.1 Xp Boost Cost +50
`Bracket Shooting` fire_control_methods_1	2.5	undefined	—	Ladder Shooting	—	`battleship`: Lg Attack +0.05 `battleship`: Hg Attack +0.05 `battle_cruiser`: Lg Attack +0.05 `battle_cruiser`: Hg Attack +0.05 Xp Boost Cost +50
`Transport Ship` mtg_transport Has a scripted effect on completion.	1.5	1922	—	Landing Craft, Multi-Product Supply Ship	—	Transport Capacity -0.33 Naval Invasion Prep Days -10 Naval Invasion Division Cap +2 Naval Invasion Plan Cap +1
`Minelaying Submarine` submarine_mine_laying	2	1922	Contact Mine	Torpedo-tube Mine Deployment	Modules: `ship_mine_layer_sub`	—
`Basic Light Battery` basic_light_battery Has a scripted effect on completion.	1	1936	Naval Gunnery	Small-Caliber Semi-Armor Piercing Shell	Modules: `ship_light_battery_2`, `ship_light_medium_battery_2`, `ship_secondaries_2`	—
`Improved Ship Torpedo Launcher` improved_ship_torpedo_launcher Has a scripted effect on completion.	1.5	1936	Basic Torpedo	Magnetic Detonator	Modules: `ship_torpedo_2`, `ship_torpedo_sub_2`	—
`Basic Heavy Battery` basic_heavy_battery Has a scripted effect on completion.	1	1936	Naval Gunnery	Armor-Piercing Capped Shell	Modules: `ship_heavy_battery_2`, `ship_super_heavy_battery_1`, `ship_medium_battery_2`	—
`Separate Fire Mains` damage_control_2	2.5	undefined	Fire Fighting Drills	Diesel-powered Emergency Pumps	—	Critical Receive Chance -0.1 Naval Critical Effect Factor -0.1 Xp Boost Cost +50
`Ladder Shooting` fire_control_methods_2	2.5	undefined	Bracket Shooting	Shell Dyes	—	Xp Boost Cost +50 `battleship`: Lg Attack +0.1 `battleship`: Hg Attack +0.1 `battle_cruiser`: Lg Attack +0.1 `battle_cruiser`: Hg Attack +0.1 `heavy_cruiser`: Lg Attack +0.05 `heavy_cruiser`: Hg Attack +0.05
`Magnetic Mine` improved_naval_mines	2	1936	Contact Mine	Acoustic Mine, Degaussing	—	Naval Mines Damage Factor +0.3
`Small-Caliber Semi-Armor Piercing Shell` basic_light_shell	0.5	1936	Basic Light Battery	Improved Light Battery	—	`destroyer`: Lg Attack +0.05 `destroyer`: Lg Armor Piercing +0.05 `light_cruiser`: Lg Attack +0.05 `light_cruiser`: Lg Armor Piercing +0.05 `heavy_cruiser`: Lg Attack +0.05 `heavy_cruiser`: Lg Armor Piercing +0.05 `battleship`: Lg Attack +0.05 `battleship`: Lg Armor Piercing +0.05 `battle_cruiser`: Lg Attack +0.05 `battle_cruiser`: Lg Armor Piercing +0.05 `carrier`: Lg Attack +0.05 `carrier`: Lg Armor Piercing +0.05
`Magnetic Detonator` magnetic_detonator	2.5	1936	Improved Ship Torpedo Launcher	Advanced Ship Torpedo Launcher	—	Xp Boost Cost +50 `destroyer`: Torpedo Attack +0.2 `submarine`: Torpedo Attack +0.2 `light_cruiser`: Torpedo Attack +0.2 `heavy_cruiser`: Torpedo Attack +0.2
`Armor-Piercing Capped Shell` basic_heavy_shell	0.5	1936	Basic Heavy Battery	Improved Heavy Battery	—	`battleship`: Hg Attack +0.05 `battleship`: Hg Armor Piercing +0.05 `battle_cruiser`: Hg Attack +0.05 `battle_cruiser`: Hg Armor Piercing +0.05 `heavy_cruiser`: Hg Attack +0.05 `heavy_cruiser`: Hg Armor Piercing +0.05
`Degaussing` degaussing	1	1938	Magnetic Mine	—	—	Naval Mines Effect Reduction +0.5 `destroyer`: Sub Detection +0.1 `light_cruiser`: Sub Detection +0.1 `heavy_cruiser`: Sub Detection +0.1
`Multi-Product Supply Ship` Gotterdammerung sp_multi_product_supply_ships	2	1938	Transport Ship, Transport Ship	Standardized Tensioned Replenishment Alongside Method	—	Underway Replenishment Range +0.25 Underway Replenishment Convoy Cost -0.2 Xp Boost Cost +75
`Improved Light Battery` improved_light_battery Has a scripted effect on completion.	1	1939	Small-Caliber Semi-Armor Piercing Shell	Small-Caliber Armor Piercing Shell, Basic Dual-Purpose Battery	Modules: `ship_light_battery_3`, `ship_light_medium_battery_3`	—
`Basic Dual-Purpose Battery` basic_dp_light_battery Has a scripted effect on completion.	1	1939	Improved Light Battery	Improved Dual-Purpose Battery	Modules: `dp_light_battery_2`, `dp_ship_secondaries_2`, `dp_light_battery_1`, `dp_ship_secondaries_1`	—
`Improved Heavy Battery` improved_heavy_battery Has a scripted effect on completion.	1	1939	Armor-Piercing Capped Shell	Super-Heavy Armor Piercing Shell	Modules: `ship_heavy_battery_3`, `ship_medium_battery_3`	—
`Diesel-powered Emergency Pumps` damage_control_3	2.5	undefined	Separate Fire Mains	Improved Repair Ship	—	Critical Receive Chance -0.1 Naval Critical Effect Factor -0.1 Xp Boost Cost +50
`Shell Dyes` fire_control_methods_3	2.5	undefined	Ladder Shooting	—	—	`battleship`: Lg Attack +0.15 `battleship`: Hg Attack +0.15 `battle_cruiser`: Lg Attack +0.15 `battle_cruiser`: Hg Attack +0.15 `heavy_cruiser`: Lg Attack +0.1 `heavy_cruiser`: Hg Attack +0.1 `light_cruiser`: Lg Attack +0.1 `light_cruiser`: Hg Attack +0.1 `destroyer`: Lg Attack +0.05 `destroyer`: Hg Attack +0.05 Xp Boost Cost +50
`Acoustic Mine` advanced_naval_mines	2	1940	Magnetic Mine	Aerial Minelaying, $airdrop_mines$, $airsweep_mines$, Aerial Minesweeping	—	Naval Mines Damage Factor +0.3
`Advanced Ship Torpedo Launcher` advanced_ship_torpedo_launcher Has a scripted effect on completion.	1.5	1940	Magnetic Detonator	Homing Torpedo	Modules: `ship_torpedo_3`, `ship_torpedo_sub_3`	—
`Improved Dual-Purpose Battery` improved_dp_light_battery Has a scripted effect on completion.	1	1940	Basic Dual-Purpose Battery	Advanced Dual-Purpose Battery	Modules: `dp_light_battery_3`, `dp_ship_secondaries_3`	—
`Landing Craft` mtg_landing_craft	2	1940	Transport Ship	Advanced Landing Craft, Improved Support Ship	Equipment: `floating_harbor_equipment_1`	Amphibious Invasion Defence +0.15 Naval Invasion Prep Days -10 Naval Invasion Division Cap +4 Naval Invasion Plan Cap +3 Show Equipment Icon true
`Torpedo-tube Mine Deployment` improved_submarine_mine_laying	2	1940	Minelaying Submarine	—	—	`submarine`: Mines Planting +0.2
`Small-Caliber Armor Piercing Shell` improved_light_shell	0.5	1942	Improved Light Battery	Advanced Light Battery	—	`destroyer`: Lg Attack +0.05 `destroyer`: Lg Armor Piercing +0.05 `light_cruiser`: Lg Attack +0.05 `light_cruiser`: Lg Armor Piercing +0.05 `heavy_cruiser`: Lg Attack +0.05 `heavy_cruiser`: Lg Armor Piercing +0.05 `battleship`: Lg Attack +0.05 `battleship`: Lg Armor Piercing +0.05 `battle_cruiser`: Lg Attack +0.05 `battle_cruiser`: Lg Armor Piercing +0.05 `carrier`: Lg Attack +0.05 `carrier`: Lg Armor Piercing +0.05
`Aerial Minesweeping` By Blood Alone airsweep_mines	2	1942	Acoustic Mine	—	—	`category_nav_bomber`: Mines Sweeping +0.1 `category_tac_bomber`: Mines Sweeping +0.15
$airsweep_mines$ By Blood Alone airsweep_mines_bba	1	1942	Acoustic Mine	—	Modules: `demining_coil`	—
`Homing Torpedo` homing_torpedo	2.5	1942	Advanced Ship Torpedo Launcher	Modern Ship Torpedo Launcher	—	Xp Boost Cost +50 `destroyer`: Naval Torpedo Hit Chance Factor +0.1 `submarine`: Naval Torpedo Hit Chance Factor +0.1 `light_cruiser`: Naval Torpedo Hit Chance Factor +0.1 `heavy_cruiser`: Naval Torpedo Hit Chance Factor +0.1 Naval Torpedo Reveal Chance Factor -0.25
`Aerial Minelaying` By Blood Alone airdrop_mines	2	1942	Acoustic Mine	—	—	`category_nav_bomber`: Mines Planting +0.05 `category_tac_bomber`: Mines Planting +0.08 `category_strat_bomber`: Mines Planting +0.13
$airdrop_mines$ By Blood Alone airdrop_mines_bba	1	1942	Acoustic Mine	—	Modules: `airdropped_mines`	—
`Super-Heavy Armor Piercing Shell` improved_heavy_shell	0.5	1942	Improved Heavy Battery	Advanced Heavy Battery	—	`battleship`: Hg Attack +0.05 `battleship`: Hg Armor Piercing +0.05 `battle_cruiser`: Hg Attack +0.05 `battle_cruiser`: Hg Armor Piercing +0.05 `heavy_cruiser`: Hg Attack +0.05 `heavy_cruiser`: Hg Armor Piercing +0.05
`Improved Support Ship` No Compromise, No Surrender sp_improved_support_ship	2	1942	Landing Craft	—	Equipment: `support_ship_2`	Xp Boost Cost +75
`Improved Repair Ship` No Compromise, No Surrender sp_improved_repair_ship	2	1942	Diesel-powered Emergency Pumps	—	Equipment: `repair_ship_2`	Xp Boost Cost +75
`Standardized Tensioned Replenishment Alongside Method` sp_standard_tenshioned_replenishment_alongside_method	2.5	1943	Multi-Product Supply Ship	—	—	Underway Replenishment Range +0.25 Underway Replenishment Convoy Cost -0.2 Xp Boost Cost +75
`Advanced Light Battery` advanced_light_battery Has a scripted effect on completion.	1	1944	Small-Caliber Armor Piercing Shell	—	Modules: `ship_light_battery_4`, `ship_light_medium_battery_4`	—
`Advanced Dual-Purpose Battery` advanced_dp_light_battery Has a scripted effect on completion.	1	1944	Improved Dual-Purpose Battery	—	Modules: `dp_light_battery_4`, `dp_ship_secondaries_4`, `dp_ship_medium_1`	—
`Modern Ship Torpedo Launcher` modern_ship_torpedo_launcher Has a scripted effect on completion.	1.5	1944	Homing Torpedo	—	Modules: `ship_torpedo_4`, `ship_torpedo_sub_4`	—
`Advanced Landing Craft` mtg_tank_landing_craft	2	1944	Landing Craft	—	—	Amphibious Invasion +0.25 Amphibious Invasion Defence +0.5 Naval Invasion Prep Days -10 Naval Invasion Division Cap +5 Naval Invasion Plan Cap +4
`Advanced Heavy Battery` advanced_heavy_battery Has a scripted effect on completion.	1	1944	Super-Heavy Armor Piercing Shell	—	Modules: `ship_heavy_battery_4`, `ship_medium_battery_4`	—