# 水平平面校准
You can use Level Horizon Calibration to compensate for small misalignments in controller orientation and to level the horizon in the QGroundControl flight view (blue on top and green on bottom).
提示
Performing this calibration step is only recommended if the autopilot's orientation is visibly misaligned with the specified orientation, or if there is a constant drift during flight in not position-controlled flight modes.
# 执行校准
To level the horizon:
- Start QGroundControl and connect the vehicle.
- Select the Gear icon (Vehicle Setup) in the top toolbar and then Sensors in the sidebar.
- Click the Level Horizon button.
:::note You should already have set the Autopilot Orientation. 如果没有，也可以在这里设置。 ::: - 将飞行器放置于水平方向：
- 这是飞行器在水平飞行时的位置（飞行器通常会向上轻微翘起！）
- 对于旋翼机，这是悬停位置。
- Press OK to start the calibration process.
- 等待校准过程结束。
# 验证
Check that the artificial horizon displayed in the flight view has the indicator in the middle when the vehicle is placed on a level surface.