Starting bathymetric survey

+ BATHYMETRY

For a bathymetric survey a GNSS receiver profile or a TPS profile and an echosounder profile must be available.

• Click Survey.

• Click Bathymetric survey.

• Before starting acquisition of points, set the functioning parameters and rules.

  

  • Mode: mode to use for automatic survey of points.

    • Time: position is acquired at preset intervals of time.

    • Distance 2D: position is acquired at preset intervals of horizontal distance.

    • Depth: the position is acquired at fixed intervals of difference in depth.

    • Single positions: the position is acquired manually pressing the Store point.

  • Route tolerance: the acceptable distance from the route. A navigation arrow shows the distance from the route. If the value is exceeded, the software shows the direction to come back to the route.

  • Measure every (sec): available for Time mode. Set the interval of time between every automatic acquisition of position.

  • Measure every (sec): available for Distance 2D mode. Set the interval of horizontal distance that must be between position to acquire and previously acquired position.

  • Measure every (sec): available for Depth mode. Set the depth interval that must between the depth to be acquired and the depth acquired previously.

• Click Next to continue to define the settings.

  

  • Store points and measurements: enables the saving of points and measurements in addition to the bathymetric sessions.

  • Adjust measured depth: the measured depth is adjusted depending on the speed of sound in water.

  • Water temperature (°C): the water temperature used to calculate the speed.

  • Water salinity (‰): the water salinity used to calculate the speed.

  • Water depth: the average water depth.

  • Speed of sound (m/s): the speed of sound.

• Click Next to start the survey.

  

• The left bar shows the elevation information:

  • : depth received from echosounder.

  • : altitude of the land below sea level calculated as GNSS elevation - echosounder depth.

• The bottom bar shows the profile measurement.

  

• Click Start session to start the session of the bathymetric survey.

• Click Stop session to stop the session of the bathymetric survey.

If echosounder is a dual beam echosounder, the information are reported for the two received elevations.