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.

Gybe count

Number of gybes performed.

Boat length (m)

Overall length of the boat.

Boat lengths lost per gybe

Boat lengths lost for each gybe.

Estimate the distance lost to gybing from the number of gybes, boat length, and boat lengths lost per gybe. 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]

Distance lost (nm)

Total distance lost to gybing.

• 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.

• Tack Loss Distance

  Estimate the distance lost to tacking from the number of tacks, boat length, and boat lengths lost per tack.

• Maneuver Time Loss

  Compute the total time and distance lost to a series of maneuvers from the maneuver count, seconds lost per maneuver, and boat speed.

• Current Gain Loss Calculator

  Calculate the distance gained or lost to the current along the course, with a favorable set positive and an adverse set negative.