Snap is a powerful feature. In its simplest form it allows for fast entry with greater precision than is possible with free hand data entry. When used with CAD files, it allows quick conversion of two dimensional data into three dimensional.
Snap Size
The Snap Size is an invisible circle that surrounds the cursor/crosshair. Data outside this limit can not be snapped to. The snap size ranges from 1 to 8; 1 being the smallest. Once data falls into this circle, the closest point to the arrow/crosshair can be snapped to. To change the snap size, select Snap Size from the Option Menu.
Also see: Snapping in Edit Mode and Snapping in Entry Mode