What is one significant danger of synchronous rolling?

Synchronous rolling presents a significant danger of capsize because it can lead to a progressive loss of stability as the vessel rolls in sync with an incoming wave pattern. When a ship rolls in synchrony with the wave, the rolling amplitude can increase significantly, resulting in larger and potentially hazardous angles of heel. As the heel angle increases, the center of gravity shifts, and if the rolling continues unchecked, the ship may reach a critical angle where the righting moment is insufficient to recover from the heel.

This situation can result in a complete overturn, or capsize, as the vessel might exceed its stability limits. It is crucial for mariners and vessel operators to be aware of the signs of synchronous rolling and to take appropriate actions to mitigate its effects, such as altering speed or course, to avoid reaching dangerous angles of heel that could lead to capsize. Understanding the dynamics of roll and the specific conditions that lead to synchronous rolling is essential for maintaining safe vessel operations at sea.