Use this sailing calculation for planning or education when the vessel, units, reference directions, environmental conditions, and assumptions are explicitly known.

Distance (nm)

Required number in nm. Distance remaining to the waypoint.

Speed (kt)

Required number in kt. Boat speed over the water or through the water.

The cited overview of Navigation supplies background for the terminology and domain context used by this tool.^[1]

Calculate sailing time to a waypoint in minutes using timeMinutes = distanceNm / speedKt * 60. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Time to waypoint (min)

Returned number in min. Time until the waypoint is reached.

• Vessel design and loading, sea state, wind, current, tide datum, weather, chart accuracy, equipment, crew, and safety margins can make real conditions differ from a simplified result.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Cross-check current charts, tide and weather services, instrument data, vessel manuals, and applicable navigation rules, and retain a conservative alternative plan.

• Portsmouth Yardstick Corrected Time Calculator

  Calculate a Portsmouth Yardstick corrected race time using correctedTimeSeconds = elapsedSeconds * 100 / pyNumber.

• Time to Start Line Calculator

  Calculate how many minutes it takes to reach the start line from the remaining distance and current boat speed.

• Figure Eight Recovery Time

  Estimate the minutes to sail two circular lobes of a figure-eight recovery path at the given boat speed, plus the final approach allowance.