Passage Planning Calculator
Plan voyage timing, fuel, water, and provisions
Voyage Details
Vessel & Crew
GPH
% of voyage under power
Voyage Timing
Estimated Passage Time
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With Delays/Margin
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Daily Distance (avg)
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Watch Cycles (4-hr)
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Fuel & Water Requirements
Motoring Time
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Fuel Required
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With 20% Reserve
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Water Required
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With 25% Reserve
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Provisions Estimate
Provision Days
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Meals to Plan
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Snacks/Day
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Passage Planning Guidelines
Timing: Always add margin for weather delays. Coastal passages typically need 10-20% margin; offshore passages 20-30% or more depending on season and route.
Fuel: Minimum 20% fuel reserve is essential. For offshore passages, consider 30-50% reserve for unexpected motoring due to calms or schedule pressure.
Water: Plan 1 gallon (4 liters) per person per day minimum. In tropical conditions, plan 1.5-2 gallons. Watermaker-equipped boats should carry backup supply.
Provisions: Plan for passage time plus 50% margin. Include easy-to-prepare meals for heavy weather days. Don't forget seasickness remedies and comfort foods.