SNAPUNIT system variable
Function Description:
The SNAPUNIT system variable is used to set the snap space for current viewport.
Type : 2D point
Saved in : Drawing
Initial value : " 0.5000,0.5000 (Imperial) or 10.0000,10.0000 (Metirc)
If specified SNAPSTYL to be 1, the X value of SNAPUNIT will be automatically adjusted to fit isometric snap.