Which of the following can contribute to increased fatigue while boating?

Increased fatigue while boating can often be attributed to natural stressors like sun glare and engine noise. Sun glare can lead to eye fatigue and discomfort, making it challenging to focus on the water or navigate effectively. This constant strain can cume to physical and mental exhaustion over time. Additionally, the noise generated by the engine can create an environment that is both loud and stressful, leading to increased fatigue as the body has to work harder to process information amid the disruptive sounds.

While calm water conditions and amenities such as ample shade can actually make the boating experience more comfortable and enjoyable, these factors would not contribute to fatigue. Similarly, the use of sunscreen is very important for protection against UV rays during prolonged sun exposure but doesn't inherently cause fatigue; in fact, it helps prevent sunburn which could otherwise lead to discomfort. Thus, natural stressors like glare and noise stand out as significant contributors to fatigue in a boating environment.