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

ORC coefficient

Optional number. ORC performance coefficient between zero point seven and one point four.

Elapsed time (s)

Required number in s. Time on course from start signal to finish.

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

Compute ORC time-on-time corrected time by multiplying elapsed seconds by the supplied Time Correction Coefficient (TCC). Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Corrected time (s)

Returned number in s. Corrected finish time used to score the race.

• 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.
• ORC coefficient must be at least 0.7.
• ORC coefficient must be no greater than 1.4.
• 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.

• IRC Corrected Time Calculator

  Compute IRC corrected time by multiplying elapsed time by the boat's published time correction coefficient (TCC).

• PHRF Time on Time Calculator

  Compute a PHRF time-on-time corrected time by scaling elapsed time with the coefficient six hundred fifty over five hundred twenty plus rating.

• PHRF Time on Distance Calculator

  Compute a PHRF time-on-distance corrected time by subtracting the rating allowance over the course length from elapsed time.