What conditions can reduce the recurrence of parametric roll?

The recurrence of parametric roll, a dangerous phenomenon where a vessel's rolling motion is amplified by the wave conditions, can indeed be mitigated by altering course or speed while ensuring proper metacentric height (GM). When a ship is navigating in particular wave patterns, making adjustments to course or speed can help to avoid resonance, which occurs when the ship's natural rolling frequency matches the frequency of the waves. A proper GM is critical because it influences the stability of the vessel; ensuring that GM is adequate during such maneuvers can enhance the ship's responsiveness and ability to recover from rolling.

By adjusting course or speed, a ship can steer itself out of the conditions that may lead to parametric roll. Furthermore, maintaining an appropriate GM ensures the vessel has the necessary stability to handle the varying conditions without excessive rolling. This combined approach of changing navigation parameters while considering the vessel's stability characteristics effectively reduces the likelihood of parametric roll occurring.