ID_SNAP_NONE   CAD > Snap > None

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Disable snapping. No pick-box is displayed at the intersection of the cursor cross-hairs.

 

Points will be selected at the location indicated by the cross-hairs. This mode is useful for freehand sketching or digitizing. When digitizing, all three coordinate values are scaled off of the drawing. However when freehand sketching, only two of the coordinates can be located and the third must be supplied from the snap base

 

ID_SNAP_DELTA CAD > Snap > Cursor/Grid Base

 

This is the recommended setting while digitizing.