What is the minimum vertical distance required between shape signals displayed on vessels?

The correct answer is that the minimum vertical distance required between shape signals displayed on vessels is indeed 2 meters. This requirement is put in place to ensure that the signals are clearly visible and easily distinguishable from one another, particularly in conditions where visibility may be limited due to weather or other factors.

The International Regulations for Preventing Collisions at Sea (COLREGs) specify that the height and spacing of shape signals must be sufficient to prevent confusion and ensure safety. By maintaining a distance of 2 meters between signals, it increases the likelihood that other vessels can identify the signals accurately, which is crucial for preventing misunderstandings that could lead to collisions or safety risks at sea.

While it might seem that certain vessels could have different requirements based on their size or type, the regulation provides a standard minimum of 2 meters to ensure a uniform approach to visibility and safety for all maritime operators.