The Snap Toolbox contains a convenient set of tools for snapping to precise locations in your drawing. By default, it is displayed to the left of the drawing area. You can click on these tools even if you are in the middle of a drawing command. The F10 key can be used to toggle the snap preview on and off.

Clicking the Off button turns off any selected snap modes. For explanations of the specific snaps,

NOTE: When Snap commands are selected from the Snap Toolbox, you have the option of making them set a point or just move to the position (Move Cursor Only option). However, if you select a Snap command from the Point menu, a point will always be set.