Click on the grid far from any corner points to clear the currently defined region and begin defining a new region. Toggles the grid display. If you have iconified the grid window it will remain iconified. Allows the user to select a grid. The grid choice does not work on SGI's.
Larger grids require more memory and can bog down the interface.
The zoom choice does not work on SGI's. These fields are editable so users may input values. The interface will adjust the input values to the center of the nearest grid cell. Displays the latitude and longitude of the current position of the mouse pointer. These fields are editable so users may input values.