# ORTHOMODE System Variable [GstarCAD 2018](Help%20System/GSTARCAD/2018/Index.md) → [System Variables](Help%20System/GSTARCAD/2018/System%20Variables/(System%20Variables).md) → [O](Help%20System/GSTARCAD/2018/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 could 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 --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/O/ORTHOMODE%20System%20Variable.md) · [GstarCAD 2017](Help%20System/GSTARCAD/2017/System%20Variables/O/ORTHOMODE%20System%20Variable.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/System%20Variables/O/ORTHOMODE%20System%20Variable.md) · [GstarCAD 2020](Help%20System/GSTARCAD/2020/System%20Variables/O/ORTHOMODE%20System%20Variable.md) · [GstarCAD 2021](Help%20System/GSTARCAD/2021/System%20Variables/O/ORTHOMODE%20System%20Variable.md)