The Select Reference button will only be active if GPS data are available. Clicking the Select Reference button opens a window that allows the user to change the navigation reference and to turn composite tracks on or off.
Summary Table
The summary table allows the user to select which transect is displayed in the graphs (by clicking on the desired row) and provides information on the number of ensembles referenced to each navigation reference.
Filename—Filename of the transect.
# Ensembles—Total number of ensembles in the transect.
# Ref BT—Number of ensembles referenced to bottom track.
# Ref GGA—Number of ensembles referenced to GGA.
# Ref VTG—Number of ensembles referenced to VTG.
# Ref INT—Number of ensembles for which the boat velocity has been interpolated.
Discharge Prev. —Total discharge prior to most recent filter change.
Discharge Now—Total discharge after applying the most recent filter change. If no filters have been changed, the discharge now will equal the discharge previous.
Discharge % Change—The percent difference between the discharge previous and the discharge now due to the last filter change.
The Boat Speed time series shows the boat speed for each of the references. The user can display or hide specific references by clicking on the check boxes (this only effects the display not the reference used).
The ShipTrack panel allows the GGA, VTG, and BT ship tracks to be compared. Invalid data are identified with a symbol, which is defined in the legend. The water vectors are only graphed on the navigation reference currently selected for discharge computation. The data shown in the graph are controlled by check boxes at the bottom of the panel.
Composite tracks is a feature that will automatically substitute one of the other valid navigation references for the selected navigation reference if the selected reference is invalid. The approach used for composite tracks in QRev is summarized in the table below. These settings apply to all transects and cannot be set differently for individual transects. QRev defaults the navigation reference to that used in the raw data. Composite tracks defaults to off.