Drone won't hold altitude steadily

Symptoms

• Drone slowly climbs or descends without stick input
• Altitude display fluctuates even while hovering
• Sudden altitude change when flying over water or reflective surfaces
• Altitude hold works outdoors but not indoors, or vice versa

Likely causes

• CommonBarometric pressure sensor affected by wind or a covered ventThe barometer that measures altitude is sensitive to airflow and can be disrupted.
• CommonDownward vision sensors confused by reflective or low-contrast surfacesWater, glass, and plain surfaces can interfere with visual altitude sensors.
• PossibleStrong wind gusts affecting hover stabilityLightweight drones are more affected by wind than altitude sensor accuracy.
• PossibleSensor needs recalibration after firmware update or travelSimilar to compass calibration, some sensors benefit from periodic recalibration.
• Less commonBarometer or vision sensor hardware faultWould cause persistent altitude drift even in calm, controlled conditions.

What to do

1. Check that the barometric sensor vent, usually a small hole in the body, isn't blocked or covered.
2. Avoid flying directly over water, glass, or highly reflective surfaces when altitude hold is critical.
3. Fly in calmer wind conditions to reduce external factors affecting hover stability.
4. Recalibrate available sensors through the app if the option exists for altitude or vision systems.
5. Update the drone's firmware to the latest version.
6. Test altitude hold over a plain, textured surface like grass or pavement to see if it improves.
7. If altitude drift continues over normal surfaces in calm conditions, have the barometer and vision sensors checked professionally.

When to call a pro

If altitude drift continues over normal ground in calm conditions, a drone repair specialist can check the barometer and vision sensors.

Safety