What does it mean when two ships are 'in-step'?

When two ships are described as 'in-step,' it means that both vessels are positioned such that they are simultaneously on the crests of waves. This positioning can be critical for maintaining a specific relative motion or for synchronization in operations, particularly in rough seas. Being in-step helps minimize the risk of one ship rolling more than the other, which could lead to unsafe situations or difficulty in maneuverability.

This concept is particularly relevant in nautical operations where coordination between vessels is crucial, such as during tow operations or when conducting maneuvers that require close proximity. The synchronization in wave motion can enhance safety and efficiency when ships are working together.

The other options do not accurately reflect the meaning of 'in-step' in this nautical context. For instance, being anchored side by side does not require the vessels to be synchronized on wave crests. Similarly, if one ship is ahead of another, they would not be 'in-step,' as that implies a difference in position rather than coordination. Lastly, both ships being at a standstill would not apply to the term, which specifically relates to their movement relative to wave crests.