Hydrographic survey is a process that measures and records the physical features of bodies of water and the land around them. The data collected from a hydrographic survey is used to create nautical charts and is essential for maritime navigation, construction, and other activities. 

Here are some things to know about hydrographic surveys: 

• Purpose

          Hydrographic surveys are used to create nautical charts for mariners, and to support activities such as offshore exploration,              construction, and maintenance. They can also be used to determine the route of subsea cables. 

• Methods

          Hydrographic surveys use a variety of methods, including multibeam echo sounders, which send out beams that bounce off                the seafloor and return to the ship to record the depth. 

• Data collection

        Hydrographic surveys collect data on water depth, navigation channels, structures, currents, tides, and waves. 

• Data analysis

         The data collected from a hydrographic survey is processed and analyzed using industry standard software. 

• Data presentation

          The data from a hydrographic survey can be presented in a variety of formats, including charts and electronic formats. 

• Maritime nations

         Hydrographic surveys are typically conducted by agencies of maritime nations