1. Pick the base point.
2. Track and pick the next point to set the z-axis for the gizmo
3. Track a rotation for the X-axis and Y-axis.
   • Hold SHIFT to change direction
   • Hold CTRL to change axis.
   • Hold ALT tracking any gizmo rotation to snap angle values.
4. Set the guide rotation angle about polar gizmo.
   • Hold ALT to override the intersection points toggle.

The line guide is divided in points that can be used as snap targets. The distance of the marks can be set on the modifier panel.