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Natural navigation relies on understanding and interpreting elements found in the natural environment to assist in finding one's way. Traditional methods involve using visual, environmental keys and phenomena.
Observations in the environment can include specifics such as landmarks, animal behavior, and vegetation patterns that can indicate certain directions. Water motion refers to the natural currents and tides that can provide guidance about navigation, making them significant aspects of navigating through aquatic environments. The sun direction/angle utilizes the position of the sun to determine east and west, especially vital for orientation during the day.
On the other hand, a depth finder is a mechanical tool that uses sonar technology to measure the depth of water. While it is an essential instrument for divers and boaters, it does not fall under the category of natural navigation since it relies on technology rather than understanding natural cues and phenomena. This distinction clarifies why the depth finder is not a method of natural navigation.