Use this sailing calculation as a planning or educational cross-check for navigation, wind and current, rig loads, stability, anchoring, tides, visibility, performance, or recovery under explicitly stated conditions.

Beam (ft)

Maximum beam of the hull.

Displacement (lb)

Displacement in pounds.

Compute the capsize screening factor; below two indicates better resistance to capsize. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

CSF

Capsize screening factor; under two is considered safer for offshore work.

• Actual conditions change with vessel design and loading, sea state, wind, current, tide datum, weather, chart accuracy, equipment, crew, regulations, and safety margins. Simplified formulas do not replace seamanship, approved stability data, or current navigation information.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Cross-check official charts, tide and weather services, instrument data, vessel manuals, and collision regulations; maintain conservative margins and a safe alternative plan.

• Fog Risk Spread Check

  Assess fog risk from the temperature dew point spread; a spread of two degrees Celsius or less indicates conditions favourable for fog formation.

• Displacement Length Ratio Calculator

  Compute the displacement-to-length ratio; below two hundred is light, above three hundred is heavy.

• Anderson Turn Course

  Calculate the return course reached by an Anderson turn, which rotates the heading two hundred forty degrees toward the chosen turn direction to bring the vessel back along its original track.