To Enter a Tentative Point (Manually) to Preview a Data Point

Select the required Snap Mode.
Position the pointer on the location at which you plan to enter a data point.
Press the Tentative button.
The tentative point coordinates are shown in the status bar. Large crosshairs are displayed. The intersection of the lines in the crosshairs marks the location of the tentative point. If you snap to an element, the element is highlighted.