Williamson Turn Course
Calculate the initial sixty-degree heading and final reciprocal course for a Williamson turn. After reaching the initial heading, reverse the rudder and steady on the reciprocal of the original course.
Description
Calculate the initial sixty-degree heading and final reciprocal course for a Williamson turn. After reaching the initial heading, reverse the rudder and steady on the reciprocal of the original course.
Williamson Turn Course is a focused tool for the following task. Calculate the initial sixty-degree heading and final reciprocal course for a Williamson turn. After reaching the initial heading, reverse the rudder and steady on the reciprocal of the original course. It reports Initial turn heading, Reciprocal course from the values you provide rather than inventing measurements, coefficients, or professional judgment that are not part of the input.
When to use Williamson Turn Course
Use this sailing calculation for planning or education when the vessel, units, reference directions, environmental conditions, and assumptions are explicitly known.
- Course (°)
- Required number in °. Course at the time of the man overboard incident.
- Turn direction
- Required string. Side the vessel turns toward.
The cited overview of Man overboard rescue turn supplies background for the terminology and domain context used by this tool.1
How Williamson Turn Course works
Calculate the initial sixty-degree heading and final reciprocal course for a Williamson turn. After reaching the initial heading, reverse the rudder and steady on the reciprocal of the original course. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.
- Initial turn heading (°)
- Returned number in °. Initial heading at which the rudder is reversed.
- Reciprocal course (°)
- Returned number in °. Final reciprocal course on which the vessel steadies.
Limitations and assumptions
- 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.
Alternative or Complementary approaches
Cross-check current charts, tide and weather services, instrument data, vessel manuals, and applicable navigation rules, and retain a conservative alternative plan.
References
-
Man overboard rescue turn — Wikipedia contributors
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