Which tool can be used to measure distance on water?

A rangefinder is an effective tool for measuring distance on water because it uses laser or radar technology to accurately determine the distance to an object. It is especially useful in aquatic environments where other methods may be impractical or less precise. The rangefinder can give instant readings even over long distances, making it applicable for various situations, such as determining distances to docks, buoys, or the shoreline.

In contrast, a measuring tape is usually a shorter tool designed for direct physical measurements and may not be practical for measuring longer distances on water. A wind gauge is specifically for measuring wind speed and direction, and although it is important for aquatic activities, it does not aid in measuring distance. A thermometer is utilized for measuring temperature, making it irrelevant for distance measurement altogether. Thus, the rangefinder is the most suitable choice for this particular task.