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[ NAVAL FLEET ] // PATROL BOAT ▼

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[SYSTEM_DOSSIER // NAV-01] // COASTAL SECURITY & RAPID RESPONSE

Patrol Boat

The Patrol Boat is the entry point into the Naval Fleet: affordable, extremely fast in Coastal Waters and built for shoreline security, scouting and rapid reaction. Its defining weakness is equally important: in Open Sea every supplied level shows -50% Attack and -50% Defense, while movement speed drops sharply.

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DossierNAV-PB-01

ClassPATROL BOAT

Levels1–6 VERIFIED

Doctrines3 VERIFIED

Primary RoleCOASTAL PATROL

WesternDays 1 / 4 / 8 / 12 / 17 / 22

EasternDays 1 / 4 / 8 / 12 / 17 / 22

EuropeanDays 1 / 4 / 8 / 12 / 17 / 22

Naval Fleet01 / 08 LIVE

Naval Terrain Is The Core Mechanic

Open Sea

-50% ATK / -50% DEF

Shown on every supplied level. Treat this as a terrain modifier, not as a permanent reduction to the stored base combat values.

Coastal Waters

Full Combat Value

No matching negative attack or defense modifier is shown in the Coastal Waters column.

Coastal Speed

2.63 → 3.75

The Patrol Boat remains dramatically faster near the coast than in Open Sea at every verified level.

Attack Range

35 → 50 → 65

The important geometry breakpoints arrive at Level 3 and Level 6.

// Patrol Boat Combat Identity //

● COASTAL SPECIALIST

Best Environment

Coastal Waters. Full visible combat value plus the much higher movement speed makes this the natural operating zone.

Worst Environment

Open Sea. Effective Attack and Defense are cut in half by the verified -50% / -50% modifiers.

Progression

L3 delivers the first serious range/radar/speed upgrade. L6 completes the profile with 65 range, 75 radar, 3.75 coastal speed, 15 HP and 50 sight.

Doctrine Research Timing

[DOC-W // WESTERN]

Western Doctrine

Patrol Boat Levels 1–6

Research Days

1 → 4 → 8 → 12 → 17 → 22

Class Names

L1–2 Mark VI · L3–5 Island-class · L6 Legend-class Cutter

Visible Stat Curve

Same verified combat and terrain progression as Eastern and European.

[DOC-E // EASTERN]

Eastern Doctrine

Patrol Boat Levels 1–6

Research Days

1 → 4 → 8 → 12 → 17 → 22

Class Names

L1–2 Raptor-class · L3–5 Bykov-class · L6 Buyan-M-class

Visible Stat Curve

Same verified combat, range, radar, speed and HP progression.

[DOC-EU // EUROPEAN]

European Doctrine

Patrol Boat Levels 1–6

Research Days

1 → 4 → 8 → 12 → 17 → 22

Class Names

L1–2 Iliria-class · L3–5 OPV 270 · L6 PPA Light

Visible Stat Curve

Same verified progression; doctrine identity is expressed through class names and visuals here.

Level Progression // Combat & Naval Geometry

Level	Day	ATK Vector	DEF Vector	ATK Range	Radar	Open Sea SPD	Coastal SPD	HP	Sight
L1	1	0 / 0 / 0 / 0 / 0 / 0 / 2 / 0 / 0 / 0	0 / 0 / 0 / 0 / 0 / 0 / 2 / 0 / 0 / 0	35	—	0.44	2.63	10	40
L2	4	0 / 0 / 0 / 0 / 0 / 0 / 2.5 / 0 / 0 / 0	0 / 0 / 0 / 0 / 0 / 0 / 2.5 / 0 / 0 / 0	35	—	0.44	2.63	11	40
L3	8	0 / 0 / 0 / 0 / 0 / 0 / 3 / 0 / 0.5 / 1	0 / 0 / 0 / 1 / 1 / 0 / 3 / 0 / 0 / 0	50	50	0.50	3.00	13	45
L4	12	0 / 0 / 0 / 0 / 0 / 0 / 3.5 / 0 / 0.5 / 1	0 / 0 / 0 / 1 / 3 / 0 / 3.5 / 0 / 0 / 0	50	50	0.50	3.00	13	45
L5	17	0 / 0 / 0 / 0 / 0 / 0 / 4 / 0 / 0.5 / 1	0 / 0 / 0 / 1 / 1 / 0 / 4 / 0 / 0 / 0	50	50	0.50	3.00	14	45
L6	22	0 / 0 / 0 / 0 / 0 / 0 / 6 / 0 / 1 / 1.5	0 / 0 / 1 / 1.5 / 5 / 0 / 6 / 0 / 0 / 0	65	75	0.63	3.75	15	50

Combat Vector Rule

The ten combat positions preserve the exact left-to-right target-icon order shown on the supplied game cards. For calculator use, select the value that belongs to the defender’s target class. Never sum the full vector.

Terrain Profile // Open Sea vs Coastal Waters

Level	Open Sea ATK	Open Sea DEF	Open Sea SPD	Coastal ATK	Coastal DEF	Coastal SPD	HP	Sight
L1	-50%	-50%	0.44	0%	0%	2.63	10	40
L2	-50%	-50%	0.44	0%	0%	2.63	11	40
L3	-50%	-50%	0.50	0%	0%	3.00	13	45
L4	-50%	-50%	0.50	0%	0%	3.00	13	45
L5	-50%	-50%	0.50	0%	0%	3.00	14	45
L6	-50%	-50%	0.63	0%	0%	3.75	15	50

// Calculator Terrain Rule //

● KEEP BASE STATS CLEAN

Open Sea Formula

Effective ATK = base target-class ATK × 0.50
Effective DEF = base target-class DEF × 0.50

Coastal Formula

Use the stored base target-class ATK/DEF. The supplied Coastal Waters column shows no matching negative modifier.

Movement

Store open_sea_speed and coastal_speed separately. Naval terrain changes movement as well as combat efficiency.

Production Progression

Level	Requirement	Mobilization Cost	Mobilization Time	Daily Upkeep
L1	Harbor 1 / Arms Industry 1	450 / 450 / 200 / 800	10 hours	35 / 15 / 20 / 60
L2	Harbor 1 / Arms Industry 1	450 / 450 / 200 / 800	11 hours	40 / 20 / 25 / 65
L3	Harbor 1 / Arms Industry 1	550 / 550 / 250 / 1,000	12 hours	50 / 30 / 35 / 75
L4	Harbor 1 / Arms Industry 1	550 / 550 / 250 / 1,000	13 hours	55 / 35 / 40 / 85
L5	Harbor 1 / Arms Industry 1	550 / 550 / 250 / 1,000	14 hours	60 / 40 / 45 / 95
L6	Harbor 1 / Arms Industry 1	650 / 650 / 300 / 1,100	16 hours	70 / 50 / 55 / 110

Upgrade Breakpoints

L1–2 // Early Coastal Gunboat

Range stays at 35, coastal speed at 2.63 and sight at 40. L2 mainly raises the main ship combat value from 2 to 2.5 and HP from 10 to 11.

L3 // First Major Upgrade

Attack range becomes 50, radar appears at 50, sight rises to 45, coastal speed reaches 3.00, and additional target-class values become active.

L4–5 // Combat Scaling

Geometry remains stable while the main naval combat value increases to 3.5 and then 4. L5 also raises HP to 14.

L6 // Final Patrol Boat

The final level reaches 6 main naval ATK/DEF, 65 range, 75 radar, 3.75 coastal speed, 15 HP and 50 sight.

// Final Player Verdict //

● CHEAP COASTAL REACTION SHIP

Use It For

Coastal defense, screening, scouting and rapid reaction where its high Coastal Waters speed can be exploited.

Do Not Use It Like

A true blue-water combatant. The permanent supplied Open Sea profile of -50% ATK / -50% DEF makes location critical.

Best Breakpoints

L3 for the first major utility increase. L6 for the complete Patrol Boat package.

[NAVAL_FLEET] // 01 OF 08

Next Naval Dossier: Corvette

Patrol Boat is live. Continue the Naval Fleet with the Corvette.

Open Corvette →