User Manual

ZEROTECH (Beijing) Intelligence Technology Co., Ltd. 24
by an ordinary fluorescent lamp.
3. During fast flight at low levels (0.5m or less), the optic flow and ultrasonic positioning system may not
work.
For more requirements for indoor flight, please refer to “Optic Flow and Ultrasonic Positioning” on page 6.
Flight Restrictions
 Maximum ascent height under the GPS positioning: 50m.
 Maximum ascent height under the optic flow and ultrasonic positioning: 3m.
 Maximum control distance: 100m (in open air free of interference).
No-Fly Zone
Please do not fly in areas where flying is illegal or restricted.
According to regulations, the surrounding areas of airports are strictly no fly zones.
In no-fly zones, DOBBY will not be able to fly while using the GPS positioning. The Aircraft Status
Indicator will be slow yellow flashing. The app will prompt the no-fly zone warning
Preflight Checklist
Please check the following items before flying. You can take off only if all of the items are OK:
1. Check that DOBBY and your mobile device have enough power;
2. Check that the Arms are fully extended;
3. Check that the propeller blades and other parts of the aircraft aren’t loose or damaged;
4. Check that the lenses on both the optic flow camera and the front facing camera are
clean.
Calibrating the Compass
DOBBY relies on the compass to determine its heading.
The compass is easily interfered with by other magnetic materials and electronic devices. This can
lead to data inaccuracies, unsafe flight or even a crash, on-site magnetic field conditions also
affects the accuracy of the compass. So, regular calibrations before flying helps the compass to work at
its best.