A hydrographic or bathometric map depicts the topography and depth of the sea bottom and tidal mudflats including any underwater, stationary objects. For these surveys, APS uses our own ROSS 2500 Three Degree Sounder. This specialized equipment has the ability to reach depths of 150 feet with corrections for salinity, turbidity and temperature. In our experience, hydrographic surveys normally encompass combinations of services including GPS, conventional surveying, High Definition 3D Surveying and such details as breakwater and dock locations. At APS, our ability to rapidly direct the best resources to specialized jobs provides our clients with outstanding surveying and mapping.