Marine Toolbox

Marine Toolbox is a comprehensive, offline-first calculation utility designed specifically for marine engineers, deck officers, seafarers, vessel masters, and nautical students.

Engineered to operate reliably in deep-sea environments without Wi-Fi, cellular networks, or server dependencies, Marine Toolbox delivers 11 precision calculators packaged inside a sleek, high-contrast Nebula Glass interface optimized for bridge and engine room readability.

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⚓ 11 PRECISION NAUTICAL CALCULATORS
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【 FUEL & PROPULSION TOOLS 】
• Fuel Consumption: Calculate total Heavy Fuel Oil (HFO) and Marine Gas Oil (MGO) consumption across Main Engine (ME) and Auxiliary Engines (AE).
• SFOC Calculator: Determine Specific Fuel Oil Consumption (g/kWh) by mass rate or volumetric density.
• Fuel Endurance: Estimate voyage autonomy and remaining days of steaming based on tank capacity and daily burn rates.
• Bunker Quantity: Plan bunkering volumes with safety margins and density correction factors.
• Fuel Cost: Calculate voyage fuel expenditure and economic speed comparisons.
• Marine Fuel Converter: Convert instantly between cubic meters (m³) and metric tonnes (MT) using standard marine density standards.

【 VESSEL DRAFT & STABILITY 】
• Ship Draft & Trim: Calculate mean forward/aft draft and vessel trim with instant status feedback.
• Under Keel Clearance (UKC): Determine gross, dynamic, and net UKC factoring in water depth, tidal height, vessel draft, and safety margins.
• Vessel Squat: Estimate shallow water hydrodynamic squat using the Barrass formula for open and confined channels.

【 NAVIGATION & TIMING 】
• Propeller Slip: Measure theoretical vs. observed engine distance and propeller slip percentage.
• ETA / Distance / Speed: Calculate required steaming speed, arrival times, and distance to waypoint with automatic unit conversions.

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✨ KEY FEATURES
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✔ 100% Offline Native: Zero internet required for calculations. Works in middle of the ocean or airplane mode.
✔ Nebula Glass UI: High-contrast Dark (Cosmos) and Daylight (Crystal Glass) themes designed for night bridge navigation and outdoor deck sunlight.
✔ Instant Local Math: Zero load spinners, zero server latency, and deterministic mathematical accuracy.
✔ Ergonomic Bridge Dock: Fast, single-thumb tab switching between tools, categories, history, and favorites.
✔ No Account Required: No passwords, logins, or cloud synchronization needed. Open and compute immediately.

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⚠️ MARITIME OPERATIONS DISCLAIMER
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Marine Toolbox calculations are intended for operational planning, verification, and educational assistance. These tools do not replace official onboard stability books, ECDIS, or vessel manufacturer documentation. The Vessel Master and Officer of the Watch (OOW) remain strictly responsible for the safe navigation, stability, and handling of the vessel at all times.