EQUIPMENT AND ACCURACY. A. Electronic positioning shall be accomplished using Real-Time Kinematic (RTK) Global Positioning System (GPS) technology. All vertical control shall be of third order accuracy, including levels for the setting of tide gauges. An automatic electronic tide recording system shall be required during all surveying and capping operations. The surveyor may use an alternate method that provides the same vertical accuracy, if approved by the Engineer. All hydrographic surveys shall meet the minimum standards for “Special Order” surveys as described in “Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys,” Federal Geographic Data Committee, Doc. No. FGDC-STD-007.5-2005.
