Maritime Master - CalcDeck

Every Formula. 1 App. Offline

Expected 31 May 2026 · Free · In-App Purchases

85 maritime calculators, one app. Try free tools today, unlock the full deck with a one-time Pro upgrade. The complete calculation toolkit for professional mariners, 85 calculators across 11 categories, built for the bridge, the classroom and the chart table. CalcDeck replaces the scattered spreadsheets, dog-eared formula cards and half-remembered equations with one fast, offline app. Whether you're plotting a passage, prepping for orals, double-checking a stability sum or converting units on a pilot ladder, the answer is two taps away. TRY BEFORE YOU BUY Start with a generous free tier, every unit converter plus core tools across navigation, tides, stability, weather and more. Unlock the full 85-calculator deck with a single one-time Pro purchase. No subscriptions. Ever. NAVIGATION Course to Steer • Speed/Distance/Time • ETA • Great Circle • Rhumb Line • Mercator & Parallel Sailing • Compass Error • Set & Drift • Running Fix • more CELESTIAL NAVIGATION Altitude Corrections • Dip • Sight Reduction • Amplitude • Azimuth • Twilight • Meridian Passage TIDAL Rule of Twelfths • Secondary Ports • Height at Time • Time at Height • Depth of Water • Tidal Stream Interpolation STABILITY & CARGO GM • Free Surface Effect • List from Weight Shift • Trim • Draft Survey • Loadline • Cargo Stowage Factor • more WEATHER & METEOROLOGY Beaufort Scale • Wind Chill • True/Apparent Wind • Dew Point • Pressure Tendency • Sea State ENGINEERING Fuel Consumption • Bunker Calcs • Propeller Slip • Engine Power • Cooling • more SAFETY & EMERGENCY Survival Time in Water • Distress Range • EPIRB Coverage • Liferaft Capacity • MoB UNIT CONVERTERS - ALL FREE Distance • Speed • Temperature • Pressure • Volume • Weight • Coordinates • Draught • Flow Rate • Density • Torque • Power COMMERCIAL & VOYAGE Voyage Estimator • Laytime • Demurrage • Bunker Costs • Charter Party • Freight YACHT & SMALL CRAFT Hull Speed • Anchor Scope • Sail Area/Displacement • more REGULATIONS & COMPLIANCE COLREGS quick refs, MARPOL discharge, work/rest hours, and more CALC PAD Chain calculations together, annotate your reasoning, and share complete workingsperfect for passage planning, exam revision, or showing your method during an audit. BUILT FOR THE BRIDGE Large tappable inputs, clear typography, full dark mode for night watches. Works 100% offline, no signal required at sea. Universal app for iPhone and iPad. NO NONSENSE No ads. No tracking. No data collection. No subscriptions. Pay once for Pro, own it forever. WHO IT'S FOR • Deck Officers and OOWs needing fast, reliable answers on watch • Cadets and students working through MCA, STCW, USCG and equivalent syllabi • Masters, pilots and chief mates double-checking critical numbers • Yacht skippers and serious recreational sailors • Maritime instructors and examiners

The developer, MARITIME MASTER LIMITED, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Provider
    • MARITIME MASTER LIMITED
    Size
    • 2.2 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 26.2 or later.
    • iPhone
      Requires iOS 26.2 or later.
    • iPad
      Requires iPadOS 26.2 or later.
    • Mac
      Requires macOS 26.2 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.2 or later.
    Languages
    • English
    Age Rating
    9+
    In-App Purchases
    Yes
    Copyright
    • © Maritime Master Limited
  • Developer Website
  • Privacy Policy

    • More by MARITIME MASTER LIMITED