Hydrographic surveys are the practice and science of measuring and describing the physical features of rivers, lakes, and oceans. Hydrographers survey and chart waters for navigation, determine water depth and measure tide currents. Hydrographic applications include the preparation of navigational charts, tide and current tables, sailing directions and related publications for commercial, industrial and recreational use.

Hydrographic surveys are required for the production of nautical charts, which are graphic portrayals of the marine environment and are essential for safe navigation. They are used to define courses and navigate ships and boats by the shortest and most economically safe route.

TYHFSS’s hydrographic surveys can be conducted from a moving platform or through shallow water wading, where depth, time, date and position are collected, collated and recorded. We use a variety of techniques that are determined by the on site conditions. TYHFSS collects data by using the most appropriate method as dictated by the existing conditions.  With the use of GPS, Robotic Total Stations, or sonar we can satisfy the need of any project.

Our Cad technicians compile sounding information, climatology, tidal information and past survey data when preparing a hydrographic plan, which shows the nature and form of the coastline or shoreline, the depths of the water and general character and configuration of the sea, lake or river bottom. Locations of dangers to navigation, the rise and fall of the tides, locations of man-made aids to navigation, and the characteristics of the Earth's magnetism may also be noted.

TYHFSS also conduct surveys for dredging and construction projects, submerged pipeline and cable crossings, location of wrecks, and maritime boundary delineation.