Designed For
Recreational boaters, sailors, fishing operators, and marine students.
Included Calculators
- Great-circle distance
- Rhumb-line course
- Speed, distance, and time
- Fuel and range
- Dead reckoning
SeaCalc
SeaCalc: Marine Nav Calc
Marine navigation calculators for great-circle and rhumb-line distance, ETA, fuel range, hull speed, dead reckoning, and conversions.
Calculation Workflow
Enter valuesUse field units and project conditions.
Review resultCheck the calculated output and assumptions.
Verify externallyConfirm against official sources where the work is regulated or safety critical.