Early hydrographic surveys consisted of depths measured by sounding pole and hand direct line, with positions based on a few-place sextant fixes to mapped reference points. Direct strains have been ropes, or lines, with depth markings and direct weights attached. 4.one.two Multi-Beam Echo Sounder (MBES) Today, MBES engineering is extensively https://christiann344tdl4.wikiparticularization.com/user