# 水平平面校准
You can use Level Horizon Calibration to compensate for small miss-alignments in controller orientation and to level the horizon in the QGroundControl flight view (blue on top and green on bottom).
提示
Leveling the horizon is highly recommended, and will result in the best flight performance. This process can also be repeated if you notice a constant drift during flight.
# 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
After the orientation is set and level-horizon calibration is complete, check in the flight view that the heading in the compass shows a value around 0 when you point the vehicle towards north and that the horizon is level (blue on top and green on bottom).