Relations/Snaps Options

Sketch options:

Enable snapping Sets all Sketch Snaps listed under Sketch Snaps.
With Enable snapping selected, all items under Sketch Snaps are selected by default except Grid.
Snap to model geometry Allows sketch entities to snap to model geometry such as edges.
Automatic relations Creates geometric relations as you add sketch elements.
Go To Document Grid Settings Sets options for the grid display and snap functionality.
Reset Restores factory defaults for all system options or only for options on this page.

Sketch Snaps

Clear or select all the types of Sketch Snaps.
Snap angle Lines snap in degree increments to the value you set.

When no other lines exist, the snap angle is based on the X-Y axes of the sketch origin.

If you sketch from the end of an existing line, the snap angle is based on the existing line.