👉 Bathygraphic is a type of marine survey that uses radar and sonar to map out underwater features like rocks, shoals, and reefs. It involves sending a high-frequency radio signal through water at a constant frequency (typically 2-4 GHz) and receiving back the same signal from the receiver every 0.5 seconds or so. The data collected from these signals is then used to create an image of the underwater environment, which can be analyzed by computer algorithms to identify features like sho
