Use this dialog box to set controls for Raster Snap, Object Snap, Polar Tracking, Snap and Grid, and AutoCAD Options.
The Raster Snap tab is specific to AutoCAD Raster Design toolset. Three other tabs (Object Snap, Polar Tracking, Snap and Grid) are AutoCAD standards and link to the AutoCAD Help system.
The Options button opens the AutoCAD Options dialog box where the Drafting tab lets you set the AutoSnap Marker Size and Aperture Size. All controls in this dialog box are explained in the AutoCAD Help system.