Boat Upgrades: Upgrade Tree & Ship Parts

The Fishboat branch of the upgrade tree – the skill tree for your boat – has 28 skills, each unlocking a boat part. Tap a skill to see the order to learn it and the total cost; below the tree, 29 parts are compared by slot.

Costs are amounts of the upgrade resource you get from Scraps of Knowledge, not a number of Scraps of Knowledge.

Which upgrades to research first: Best Upgrades

Where to find Scraps of Knowledge: Torn Pages & Upgrades

Fishboat28 skills

Scroll sideways to see the whole tree.

Plan an upgrade

Target skill

Tap a skill in a tree, or choose one above, to see the order to learn it and what you need.

Boat parts by slot

29 boat parts grouped by the slot they fit, from the first tier up. Each row shows the part's ratings, how to unlock it in the upgrade tree and its crafting materials.

Rating numbers are given per part; a minus lowers that rating. The number in small type is the change from the tier above it. Fuel range values are a guide.

Unlock costs are amounts of the upgrade resource you get from Scraps of Knowledge, not a number of Scraps of Knowledge.

Parts are listed under the slot type they fit. Some listed parts may not actually be equippable there.

Engine1 slot

Part	Speed	Unlock	Crafting materials
Standard EngineInstalled at start An engine that is easy to repair and maintain, which makes it popular among anglers. It cannot boast either speed or reliability.	12	Unlocked from the start	Metal Plate×4 Gear×2 Recipe
Upgraded Engine Thanks to its rebuilt valve mechanism, it noticeably increases the boat's speed and maneuverability.	15(+3)	Cost 2Cost 4 from the start (incl. prerequisites)Requires: Hull Protection	Metal Plate×10 Gear×4 Machine oil×2 Carburetor×1 Recipe
Heavy-Duty Engine New pistons and a massive crankshaft increase the boat's speed. The engine performs well even in harsh aquatic conditions.	17(+2)	Cost 2Cost 6 from the start (incl. prerequisites)Requires: Upgraded Engine	Metal Plate×14 Gear×6 Thermo Coil×2 Machine oil×3 Carburetor×2 Recipe
Reinforced Engine Reworked cylinder head and a reinforced crankshaft give this engine a serious edge in both speed and handling.	18(+1)	Cost 3Cost 14 from the start (incl. prerequisites)Requires: Plated Hull Protection	Metal Plate×16 Gear×6 Carburetor×2 Machine oil×3 Thermo Coil×3 Cable×1 Recipe
Precision Engine Machined to tighter tolerances than any stock engine, it delivers smooth, reliable power with noticeably sharper handling.	20(+2)	Cost 3Cost 17 from the start (incl. prerequisites)Requires: Reinforced Engine	Metal Plate×20 Gear×7 Carburetor×3 Machine oil×4 Thermo Coil×4 Relay tubes×2 Cable×4 Recipe
Prototype Engine A one-of-a-kind engine built from salvaged pre-Collapse parts. Unmatched speed and control, if you can keep it running.	22(+2)	Cost 4Cost 21 from the start (incl. prerequisites)Requires: Precision Engine	Metal Plate×24 Gear×8 Carburetor×3 Machine oil×5 Thermo Coil×5 Relay tubes×3 Glowbug×1 Recipe

Propeller1 slot

Part	Handling	Unlock	Crafting materials
Old PropellerInstalled at start A rusty, chipped propeller. Its main advantage is that it simply exists. Don't expect any maneuverability.	1	Unlocked from the start	Metal Plate×3 Rubber×1 Recipe
Upgraded Propeller A rebuilt propeller. The rusty parts have been cleaned and oiled, and the impeller and rubber gaskets have been replaced. All of this has a noticeable effect on the vessel’s maneuverability.	3(+2)	Cost 2Cost 6 from the start (incl. prerequisites)Requires: Upgraded Engine	Metal Plate×4 Gear×1 Rubber×2 Chromatic Scales×1 Recipe
Balanced Propeller Hand-balanced blades and a fresh bearing take the wobble out of the shaft. The boat answers the helm quicker and holds its turn.	5(+2)	Cost 2Cost 13 from the start (incl. prerequisites)Requires: Plated Hull Protection	Metal Plate×6 Gear×2 Rubber×3 Chromatic Scales×2 Recipe
Duralumin Propeller Light duralumin blades cut through the murk with far less drag. Tight turns in narrow channels stop being a gamble.	7(+2)	Cost 3Cost 16 from the start (incl. prerequisites)Requires: Balanced Propeller	Metal Plate×8 Impeller×1 Gear×2 Rubber×3 Jaws×2 Recipe
Deep-Water Propeller Built around a propeller shaft salvaged from a deep-water vessel. Steady, precise and hard to foul, even in thick weeds.	9(+2)	Cost 3Cost 17 from the start (incl. prerequisites)Requires: Reinforced Engine	Metal Plate×10 Impeller×2 Gear×3 Rubber×3 Jaws×4 Bone Plate×2 Recipe
Prototype Propeller A pre-Collapse blade profile reproduced by hand. The boat turns almost on the spot and obeys the slightest touch of the wheel.	11(+2)	Cost 4Cost 21 from the start (incl. prerequisites)Requires: Deep-Water Propeller	Metal Plate×14 Impeller×3 Gear×4 Rubber×4 Coral Tail×1 Bone Plate×4 Recipe

Afterburner1 slot

Part	Boost	Unlock	Crafting materials
Afterburner A system that forces fuel into the engine. It provides a brief burst of power, which helps you escape danger.	5	Cost 2Cost 8 from the start (incl. prerequisites)Requires: Small fish hold	Metal Plate×4 Bug slime×2 Coral fibers×6 Rubber×2 Recipe
Advanced Afterburner The pneumatic system builds up pressure during normal cruising, and when the air is released, it increases power and extends the duration of the burst.	8(+3)	Cost 2Cost 10 from the start (incl. prerequisites)Requires: Afterburner	Metal Plate×6 Alcohol×3 Rubber×3 Bug slime×5 Recipe
Injector Afterburner A motorcycle carburetor turned into a boost injector. It floods the engine with fuel on demand and delivers a much harder push.	12(+4)	Cost 3Cost 17 from the start (incl. prerequisites)Requires: Reinforced Engine	GasCylindre×1 Alcohol×4 Gunpowder×4 Rubber×3 Recipe
Prototype Afterburner Twin gas cylinders and a controlled injector. A violent burst of speed that can outrun almost anything in these waters.	16(+4)	Cost 4Cost 21 from the start (incl. prerequisites)Requires: Injector Afterburner	GasCylindre×2 Alcohol×5 Gunpowder×6 Rubber×4 Relay tubes×2 Swamp Lily×3 Recipe

Fuel tank1 slot

Part	Fuel range	Unlock	Crafting materials
Fuel TankInstalled at start A standard sheet-metal fuel tank. Spacious enough to keep you from stalling halfway between islands, but nothing more.	360	Unlocked from the start	Metal Plate×5 Rubber×2 Bug slime×2 Recipe
Riveted Fuel Tank A heavier riveted tank with a reserve drum bolted on. Holds enough fuel to reach the far islands and still find your way back.	720(+360)	Cost 3Cost 5 from the start (incl. prerequisites)Requires: Hull Protection	Metal Plate×10 Bone Plate×4 Rubber×4 Bug slime×3 Cloth×2 Recipe

Fish hold3 slots

Part	Storage	Unlock	Crafting materials
Small fish holdInstalled at start ×2 A small container that increases the capacity of the hold.	13	Cost 2Cost 6 from the start (incl. prerequisites)Requires: Upgraded Engine	Metal Plate×4 Coral fibers×3 Bug slime×2 Rope×2 Rusty Hinge×2 Recipe
Medium fish hold Standard fish hold. It helps separate predatory and non-predatory fish into separate compartments and keeps them fresh longer during transport.	20(+7)	Cost 3Cost 14 from the start (incl. prerequisites)Requires: Plated Hull Protection	Metal Plate×8 Coral fibers×5 Rubber×3 Bug slime×3 Cloth×3 Rusty Hinge×3 Recipe
Large fish hold Large, heavy hold for extended fishing expeditions	30(+10)	Cost 4Cost 18 from the start (incl. prerequisites)Requires: Reinforced Engine	Metal Plate×14 Bone Plate×7 Rubber×4 Bug slime×4 Cloth×4 Rope×3 Rusty Hinge×4 Recipe

Hull sides4 slots

Part	Speed	Protection	Unlock	Crafting materials
Hull Protection A makeshift-reinforced hull. Increases the boat’s durability and provides additional protection for you.	−1	10	Cost 2Cost 2 from the start (incl. prerequisites)Requires: Standard Engine	Coral fibers×3 Bug slime×2 Rope×2 Rubber×2 Recipe
Plated Hull Protection Metal plates bolted over the hull and sealed with chitin. Absorbs heavy blows, at the cost of some speed.	−2(−1)	25(+15)	Cost 3Cost 11 from the start (incl. prerequisites)Requires: Afterburner	Metal Plate×6 Jaws×4 Coral fibers×4 Rubber×3 Bug slime×3 Recipe
Armored Hull Armored plating with an ebonite coating. Turns the boat into a floating bulwark that shrugs off most attacks, but makes it noticeably heavier.	−3(−1)	50(+25)	Cost 4Cost 22 from the start (incl. prerequisites)Requires: Large fish hold	Metal Plate×10 Bone Plate×4 Coral fibers×5 Rubber×4 Bug slime×4 Bony Horn×1 Recipe

Spotlight1 slot

Part	Lighting	Unlock	Crafting materials
Broken SpotlightInstalled at start Old and battered searchlight, worn by life. The bulb barely glows, but the wiring and reflectors are still intact.	3	—	—
Spotlight A light source that you carry with you into the darkest corners of the flooded world. Sometimes, it’s the only one around. And even such a simple flashlight is far better than wandering in the dark.	6(+3)	Unlocked from the start	Battery×1 Cable×2 Metal Plate×2 Rubber×1 Recipe
Long-Range Spotlight A rebuilt searchlight with a silvered reflector and a stronger lamp. Its beam reaches far into the dark and holds steady.	10(+4)	Cost 3Cost 9 from the start (incl. prerequisites)Requires: Small fish hold	Battery×2 Cable×3 Relay tubes×2 Metal Plate×4 Thermo Coil×3 Rubber×2 Recipe

Side Modules2 slots

Part	Fuel canisters	Unlock	Crafting materials
Small Canister Rack A short welded rack for a single fuel canister. One spare canister on board can be the difference between reaching the dock and drifting till dawn.	1	Cost 2Cost 7 from the start (incl. prerequisites)Requires: Riveted Fuel Tank	Rusty Hinge×2 Rope×2 Rubber×1 Metal Plate×2 Recipe
Dual Canister Rack An expanded rack that holds two fuel canisters. With this much fuel in reserve, you won’t need to worry about an urgent refueling stop along the way.	2	Cost 3Cost 10 from the start (incl. prerequisites)Requires: Small Canister Rack	Rusty Hinge×4 Metal Plate×4 Rope×3 Rubber×2 Jaws×2 Recipe

Boat decorations

Figurines, flags and helms decorate the boat. They have no slot in the tables above, and all their ratings are 0. Those marked DLC come with that DLC; the others are placed in the world for you to pick up (see the map on each item's page).