Which method makes compass use more effective for divers?

Practicing on land enhances the effectiveness of compass use for divers by allowing them to become familiar with a compass's functionality and techniques for orienting themselves in a controlled environment. This practice helps divers learn how to align the compass with their intended heading and understand how to account for variations in magnetic north versus true north.

Having a solid foundational understanding of compass navigation is crucial before applying these skills underwater, where visibility can be limited, and environmental factors can skew orientation. On land, divers can focus on mastering compass bearings, plotting courses, and using landmarks without the complexities that arise in a subaquatic setting. This preparation helps ensure that when divers are underwater, they can confidently utilize the skills they've practiced, making navigation more effective and less stressful.

Other options, while they may seem beneficial, do not directly enhance compass skills in the same foundational way. For example, using a GPS device is not applicable underwater and therefore does not aid in compass education, while increased speed of swimming can lead to mishaps if one is disoriented or not properly using the compass. Relying solely on visual cues can lead to navigational errors, especially underwater where visibility can fluctuate and external references may not be as reliable.