View the original (red) sonic curve, the correcting (green)time depth curve, and the corrected (blue) sonic curve that results from the time depth curve being applied to the original sonic curve.

Drag a time-depth reading by velocity or depth, or type the desired values in the Edit Options pane.

Right-click to insert a new time-depth reading.

Drag to select multiple time depth readings.

Select the time depth curve to use above the chart and select time depth readings to adjust in the Edit Options pane. CTRL+Click or SHIFT+Click for multiple selection.

Modify a reading selected in the grid (or clicked in the Curve Display pane), and then click Update, or click New to add an additional time depth reading.

Select whether to affect the velocity or the depth of the time-depth curve when you drag it using the Curve Display pane.

Select whether to change the velocity above and below the selected node point or only above the selected node. The default option, Lock all but selected node times constrains the changes to the nodes immediately above and below the selected node preventing the remaining depths from changing. Generally, this is the preferred option.

Select the method by which to apply the drift correction. Spline curve is the preferred method, as the correction is applied more gradually across the entire zone. Linear applies more drastic changes, which may cause additional reflection coefficients.

Select the depth or velocity range to display and the preferred view that appears in the Curve Display pane.