Final answer:
3) Compass navigation, The most commonly used method of finding your way under water is compass navigation due to its reliability and user-friendliness compared to natural navigation or computer navigation.
Step-by-step explanation:
The most commonly used method of finding your way under water is compass navigation. Natural navigation relies on using environmental cues, such as sunlight and bottom contours, but it might not be as reliable as a compass, especially in areas where visibility is low or the environment lacks distinctive features.
Computer navigation makes use of sophisticated dive computers that can assist with navigation; however, these are not as commonly used as the basic, durable, and user-friendly compass. Therefore, when diving, especially in unfamiliar areas or where visibility is poor, divers often rely on a compass to help them navigate.
The most commonly used method of finding one's way underwater is **3) Compass navigation.** Underwater navigation typically relies on specialized underwater compasses, which function similarly to surface compasses but are designed for underwater conditions. These compasses help divers maintain their direction and navigate through submerged environments.
Natural navigation (option 1) may be challenging underwater due to limited visibility, and computer navigation (option 2) is often used in conjunction with other methods but may not be the primary means. Therefore, the use of a compass remains a fundamental and widely employed method for underwater navigation, providing a reliable reference for direction.