Early hydrographic surveys consisted of depths measured by sounding pole and hand lead line, with positions based on three-point sextant fixes to mapped reference details. Guide traces have been ropes, or lines, with depth markings and guide weights hooked up. Hydrographic surveying, often called bathymetric surveying, would be the science https://tituslainu.prublogger.com/31729746/facts-about-hydrographic-survey-in-dhaka-revealed