The term denotes a navigational tool displaying the varying underwater heights of Mobile Bay. These charts utilize contour lines and color gradients to represent bathymetric data, indicating the seabed’s configuration. For example, a chart might show a consistent depth of 12 feet across much of the central shipping channel, with shallower areas of 6 feet closer to the shoreline.
These detailed representations are essential for safe and efficient maritime navigation. Understanding the submerged topography prevents groundings, optimizes vessel routing, and aids in infrastructure development. Historically, physical soundings were required to create these charts; modern technology employs sonar and LiDAR for increased accuracy and efficiency.
