Geophysical survey capabilities are offered beyond simple acoustic sounding. SDI combines Resistivity profiling techniques with acoustic hydrographic and sub-bottom profiling to offer more complete survey capabilities where acoustic technique alone cannot suffice. Survey capabilities include real-time kinematic positioning accurate to within 2cm, with real water level and heave compensation. Data post-process capabilities include volume, contour, cross section, boundary, as-built and standard GIS products. In-house laboratory accommodates sediment analysis, including classification/grain size and water chemistry. Specialty Devices has developed safety and quality control procedures, which ensures control over all aspects of project accuracy, costs, safety and deadlines.