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.
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 Transect Displayed
Filename of the transect displayed in the graphs.
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 Referenced Used
The Reference Used time series displays the reference used for each ensemble of the selected transect.
VTG--GPS using VTG data type
GGA--GPS using GGA data type
BT--Bottom track; INT--Interpolated by QRev
INV--Invalid (no data and no interpolation)
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 Boat Speed
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).
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 Ship Track
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.
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 Select Reference
The Selected Reference panel shows the currently selected reference and allows the user to change the reference by clicking on the radio buttons.
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 Composite Tracks
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.
Reference Quality
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Reference Used
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Bottom Track (BT) Selected
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BT valid
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BT
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BT invalid
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VTG
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BT invalid, VTG invalid
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GGA
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BT invalid, VTG invalid, GGA invalid
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Interpolate from BT data
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GGA Selected
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GGA valid
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GGA
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GGA invalid
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VTG
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GGA invalid, VTG invalid
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BT
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GGA invalid, VTG invalid, BT invalid
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Interpolate from GGA data
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VTG Selected
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VTG valid
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VTG
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VTG invalid
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GGA
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VTG invalid, GGA invalid
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BT
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VTG invalid, GGA invalid, BT invalid
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Interpolate from VTG data
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 Graphics Toolbar
Allows user to zoom, pan, and query the graphs. For more information see Toolbar.
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 Add Comment
Allows the user to add a comment. For more information see Comment Button.
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 User's Guide
Opens this User's Guide.
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 Close Window
Closes window and returns control to the main window.
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