Switches
Grid Click this checkbox to display a regular pattern of grid dots to help you keep track of distances and sizes. The dots are only a visual aid and are not part of your final drawing. Toggle the display of the grid with the Grid button on the command line, or type GRIDON or GRIDOFF at the command prompt.
Snap locking makes points that you select on screen jump to coordinates at a spacing that you choose. SNAP may also be toggled with the Snap button on the command line, or by typing SNAPON and SNAPOFF at the command prompt.
Cursor snap Cursor snap locks the cursor to the snap points. When snap locking is on, cursor snap makes cursors "jump" to snap points instead of moving smoothly over the screen. Toggle with the CsrSnap button on the command line.
Ortho locking temporarily forces new lines to be horizontal or vertical. Rubber-band cursors also lock to horizontals and verticals when orthogonal locking is on. Toggle on and off with the Ortho button on the command line.