# ORTHOMODE System Variable [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).md) → [O](Help%20System/GSTARCAD/2026/System%20Variables/O/(O).md) ## Function Description: The ORTHOMODE system variable is used to constrain cursor movement in perpendicular direction. | | | | --- | --- | | Type | Integer | | Saved in | Drawing | | Initial value | 0 | | Range | 0,1 | When the ORTHOMODE is on, the cursor can move horizontally and perpendicularly relative to UCS and current grid rotation angle. ## System Variable Value: **0:** turn ortho mode off **1:** turn ortho mode on --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables_Ogsv/ORTHOMODE.html) · © Gstarsoft Co., Ltd.