water level duration of observations. and distance from water level gauge. associated with spatial separation of water (B) level measurements. E3.3 Water Level Reduction E3.3a Water Vessel squat Use information, and vessel level reduction Lever-arms and Position parameters to reduce soundings to a of soundings Reference Point offsets specified datum. Vertical datums for sounding reduction (I) E3.3b Reduction Predicted tides versus Configure and calibrate GNSS to reduce measured tide reduction of soundings soundings to a specified survey datum. Co-tidal charts GNSS Reduction of survey data to a observations using GNSS observations Reduction of survey data using (I) water level observations E3.4 Currents E3.4a The relationship between Explain the forces behind currents and streams and currents and tides change in currents with tides. currents Rectilinear and rotary streams Methods for measuring tidal (B) streams and currents, including E3.4b Current Describe techniques for current current meters, acoustic measurement measurement and identify appropriate current profilers (ADCP) and and portrayal methods for acquiring and displaying drogues. current data. Current surveys (B) Surface current observation Portraying current data E4: Positioning E4.1 Geodesy E4.1a Shape of the Earth Describe as a sphere, the shape of the Earth in terms
duration of observations. associated with spatial separation of water level measurements. water level (B) and distance from water level gauge. E3.3 Water Level Reduction E3.3a Water level reduction of soundings (I) Vessel squat Lever-arms and Position Reference Point offsets Vertical datums for sounding reduction Predicted tides versus measured tide reduction Co-tidal charts Reduction of survey data to a using GNSS observations Reduction of survey data using water level observations Use information, and vessel parameters to reduce soundings to a specified datum. E3.3b Reduction of soundings GNSS observations (I) Configure and calibrate GNSS to reduce soundings to a specified survey datum. E3.4 Currents E3.4a streams and currents (B) The relationship between currents and tides Rectilinear and rotary streams Methods for measuring tidal streams and currents, including current meters, acoustic current profilers (ADCP) and drogues. Current surveys Surface current observation Portraying current data Explain the forces behind currents and change in currents with tides. E3.4b Current measurement and portrayal (B) Describe techniques for current measurement and identify appropriate methods for acquiring and displaying current data. E4: Positioning E4.1 Geodesy E4.1a Shape of the Earth as a sphere, Describe the shape of the Earth in terms
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