Naval

All 38 Naval research technologies from HOI4 v1.19 — real costs, years, prerequisites and unlocks mined from the game files.

Naval technologies (38 entries)
Tech	Cost	Year	Prerequisites	Leads to	Unlocks	Effects
`Passive Sonar` sonar Has a scripted effect on completion.	1.5	1922	Early Destroyer	Active Sonar	Modules: `ship_sonar_1`	—
$ship_hull_submarine_1$ early_ship_hull_submarine Has a scripted effect on completion.	1.5	1922	—	$ship_hull_submarine_2$	Equipment: `ship_hull_submarine_1` Modules: `sub_ship_engine_1`	—
`Deck Conversions` early_ship_hull_carrier	1.75	1922	—	1936 Carrier Hull	Equipment: `ship_hull_carrier_conversion_bb`, `ship_hull_carrier_conversion_ca` Modules: `ship_armor_carrier_deck`, `carrier_ship_engine_1`, `ship_deck_space`	—
`Early Cruiser` Man the Guns early_ship_hull_cruiser Has a scripted effect on completion.	1.5	1922	—	1936 Cruiser Hull	Equipment: `ship_hull_cruiser_1` Modules: `ship_airplane_launcher_1`, `cruiser_ship_engine_1`, `ship_armor_cruiser_1`	—
`Basic Cruiser Armor Scheme` basic_cruiser_armor_scheme Has a scripted effect on completion.	0.5	1922	— XOR [object Object]	Inclined Belt Armor Scheme	Modules: `ship_armor_cruiser_2`	Xp Boost Cost +50
`Early Heavy Ship` early_ship_hull_heavy Has a scripted effect on completion.	1.75	1922	—	1936 Heavy Ship Hull	Equipment: `ship_hull_heavy_1` Modules: `ship_armor_bb_1`, `heavy_ship_engine_1`, `ship_armor_bc_1`	—
`Early Destroyer` Man the Guns early_ship_hull_light	1.5	1922	—	Basic Destroyer, Smoke Generators, Basic Depth Charges, Passive Sonar	Equipment: `ship_hull_light_1` Modules: `light_ship_engine_1`, `ship_seaplane_tender_1`	—
`Smoke Generators` smoke_generator	0.75	1922	Early Destroyer	—	—	Naval Retreat Speed +0.2
`Basic Depth Charges` basic_depth_charges Has a scripted effect on completion.	1.5	1922	Early Destroyer	Depth Charge Thrower	Modules: `ship_depth_charge_1`	Xp Boost Cost +50
`Inclined Belt Armor Scheme` basic_heavy_armor_scheme Has a scripted effect on completion.	1.25	1936	Basic Cruiser Armor Scheme, 1936 Heavy Ship Hull	All-or-Nothing Armor Scheme	Modules: `ship_armor_bb_2`, `ship_armor_bc_2`, `ship_armor_cruiser_3`	Xp Boost Cost +50
`Active Sonar` improved_sonar Has a scripted effect on completion.	1	1936	Passive Sonar	Advanced Sonar	Modules: `ship_sonar_2`	—
$ship_hull_submarine_2$ Gotterdammerung basic_ship_hull_submarine Has a scripted effect on completion.	1.5	1936	$ship_hull_submarine_1$	$ship_hull_submarine_3$, AIP-Diesel Combination Engines	Equipment: `ship_hull_submarine_2` Modules: `sub_ship_engine_2`	—
`1936 Carrier Hull` No Compromise, No Surrender basic_ship_hull_carrier Has a scripted effect on completion.	1.5	1936	Deck Conversions	Improved Carrier	Equipment: `ship_hull_carrier_1` Modules: `carrier_ship_engine_2`	—
`1936 Cruiser Hull` basic_ship_hull_cruiser	1.5	1936	Early Cruiser	Improved Cruiser	Equipment: `ship_hull_cruiser_2` Modules: `cruiser_ship_engine_2`, `ship_airplane_launcher_2`	—
`1936 Heavy Ship Hull` basic_ship_hull_heavy	1.5	1936	Early Heavy Ship	Improved Heavy Ship, Inclined Belt Armor Scheme	Equipment: `ship_hull_heavy_2` Modules: `heavy_ship_engine_2`	—
`Basic Destroyer` basic_ship_hull_light	1.5	1936	Early Destroyer	Improved Destroyer	Equipment: `ship_hull_light_2` Modules: `light_ship_engine_2`, `ship_seaplane_tender_2`	—
`All-or-Nothing Armor Scheme` improved_heavy_armor_scheme Has a scripted effect on completion.	1.25	undefined	Inclined Belt Armor Scheme	—	Modules: `ship_armor_bb_3`, `ship_armor_bc_3`, `ship_armor_cruiser_4`	Xp Boost Cost +50
`Depth Charge Thrower` improved_depth_charges Has a scripted effect on completion.	1.5	1936	Basic Depth Charges	Depth Charge Mortar	Modules: `ship_depth_charge_2`	Xp Boost Cost +50
`Basic Submarine Snorkel` basic_submarine_snorkel Has a scripted effect on completion.	1	1939	$ship_hull_submarine_3$	Improved Submarine Snorkel	Modules: `ship_sub_snorkel_1`	—
`AIP-Diesel Combination Engines` Gotterdammerung sp_aip_engine_improved_tech	2	1939	$ship_hull_submarine_2$	High-Speed Walter Engines	Modules: `ship_engine_sub_aip_2`	—
`Advanced Sonar` advanced_sonar Has a scripted effect on completion.	1	1939	Active Sonar	Modern Sonar	Modules: `ship_sonar_3`	—
$ship_hull_submarine_3$ improved_ship_hull_submarine	2	1939	$ship_hull_submarine_2$	$ship_hull_submarine_4$, Basic Submarine Snorkel	Equipment: `ship_hull_submarine_3` Modules: `sub_ship_engine_3`	—
`Improved Carrier` Gotterdammerung improved_ship_hull_carrier Has a scripted effect on completion.	1.5	1939	1936 Carrier Hull	Advanced Carrier, Refined Pykrete	Equipment: `ship_hull_carrier_2` Modules: `carrier_ship_engine_3`	—
`Improved Cruiser` improved_ship_hull_cruiser	1.5	1939	1936 Cruiser Hull	Advanced Cruiser	Equipment: `ship_hull_cruiser_3` Modules: `cruiser_ship_engine_3`	—
`Improved Heavy Ship` improved_ship_hull_heavy	1.5	1939	1936 Heavy Ship Hull	Advanced Heavy Ship	Equipment: `ship_hull_heavy_3` Modules: `heavy_ship_engine_3`	—
`Improved Destroyer` improved_ship_hull_light	1.5	1939	Basic Destroyer	Advanced Destroyer	Equipment: `ship_hull_light_3` Modules: `light_ship_engine_3`	—
`Depth Charge Mortar` advanced_depth_charges Has a scripted effect on completion.	1.5	1939	Depth Charge Thrower	Improved Depth Charge Mortar	Modules: `ship_depth_charge_3`	Xp Boost Cost +50
`Refined Pykrete` Gotterdammerung sp_refined_pykrete	1	1942	Improved Carrier	Ice Composite Runways	Modules: `ship_armor_ice_carrier_deck_2`	—
`Improved Submarine Snorkel` improved_submarine_snorkel Has a scripted effect on completion.	2	1943	Basic Submarine Snorkel	—	Modules: `ship_sub_snorkel_2`	Xp Boost Cost +50
`High-Speed Walter Engines` sp_aip_engine_advanced_tech	2	1943	AIP-Diesel Combination Engines	—	Modules: `ship_engine_sub_aip_3`	—
`Modern Sonar` modern_sonar Has a scripted effect on completion.	1	1943	Advanced Sonar	—	Modules: `ship_sonar_4`	—
$ship_hull_submarine_4$ advanced_ship_hull_submarine	2	1943	$ship_hull_submarine_3$	—	Equipment: `ship_hull_submarine_4` Modules: `sub_ship_engine_4`	—
`Advanced Carrier` Gotterdammerung advanced_ship_hull_carrier Has a scripted effect on completion.	1.5	1943	Improved Carrier	—	Equipment: `ship_hull_carrier_3` Modules: `carrier_ship_engine_4`	—
`Advanced Cruiser` advanced_ship_hull_cruiser	1.5	1943	Improved Cruiser	—	Equipment: `ship_hull_cruiser_4` Modules: `cruiser_ship_engine_4`	—
`Advanced Heavy Ship` Gotterdammerung advanced_ship_hull_heavy Has a scripted effect on completion.	1.5	1943	Improved Heavy Ship	—	Equipment: `ship_hull_heavy_4` Modules: `heavy_ship_engine_4`	—
`Advanced Destroyer` advanced_ship_hull_light	2	1943	Improved Destroyer	—	Equipment: `ship_hull_light_4` Modules: `light_ship_engine_4`	—
`Improved Depth Charge Mortar` modern_depth_charges Has a scripted effect on completion.	1.5	1943	Depth Charge Mortar	—	Modules: `ship_depth_charge_4`	Xp Boost Cost +50
`Ice Composite Runways` sp_ice_composite_runawayas	1	1944	Refined Pykrete	—	Modules: `ship_armor_ice_carrier_deck_3`	—