Which of the following environmental conditions does NOT promote fatigue?

Calm sea conditions are indeed a factor that does not promote fatigue. When conditions at sea are calm, there is typically less physical strain on the crew members. They are able to maintain a stable position without the constant effort required to counterbalance waves or turbulent waters. In contrast, adverse environmental conditions like glare from the sun, windy weather, and vibration from the boat engine can all contribute to fatigue by making it difficult for crew members to focus, increasing the physical demands on their bodies, and creating a less comfortable environment overall. Each of these factors can disrupt performance and lead to increased tiredness, making calm conditions an important aspect of maintaining crew stamina and efficiency.