Which of the following factors does NOT affect a vessel's range?

The number of crew members aboard a vessel does not significantly impact its range. Range is generally determined by factors that affect the vessel's performance in the water and its fuel efficiency, such as environmental conditions and the vessel's physical state.

Wind influences a boat's speed and fuel consumption, especially in sailboats, where it can either aid or hinder progress depending on its direction and strength. Marine growth on the hull can create drag, increasing resistance and requiring more power or fuel to maintain speed, thus affecting range. Currents also play a crucial role, as they can either assist or impede a vessel's movement through the water, affecting how much fuel is needed to achieve desired speeds.

In contrast, the number of crew members onboard does not materially change how far the vessel can travel under a given amount of fuel or in given conditions. While crew efficiency and workload can influence operational capabilities, they do not alter the physical aspects that define the vessel's range.