The current grid is a plane of grid points or grid lines that may be displayed in a Graphic view; it does not form part of the model but it may be used in conjunction with various sculpt commands to edit the model. Coordinates are reported with respect to current grid axes.
The coordinates of all nodes are stored in global axes; this is reflected in the nodal properties pane. However, they are displayed and edited in the axes of the current grid plane in the nodal table. The default current grid is the global grid plane (which refers to global axes and has the elevation set to zero).