3.2.4-15 Graphic Tablet Size and Orientation

Transparent grids that are used as display overlays should conform to the size of the display. Grids that are displaced from the display should approximate the display size and should be mounted below the display in an orientation to preserve directional relationships to the maximum extent.

Additional Information:
For example, a vertical plane passing through the north/south axis on the grid should pass through or be parallel to the north/south axis on the display.