You can control the display of layers, use object snaps, and adjust display settings with attached underlays.
You can turn layers on and off in an underlay.
You specify an underlay’s position, scale, or rotation when you attach an underlay file. You can also modify these settings later during the drafting process.
Use object snaps to draw or edit objects relative to a precise location.
You can modify the contrast, fade, and monochrome settings of an underlay. Also, so that the underlay is visible, you can adjust the underlay colors based on the AutoCAD background colors.
You can use a clipping boundary to clip an underlay.
You can display and plot a border around the underlay or the clipping boundary.