TheMann58
Captain
Flight distance : 18669501 ft
United States
Offline
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SAR Steve -
I do not own a Matrice 200. However, I do own a P3Pro, P4, P4Pro and an Inspire 1 and have been flying them for 3 years. This is what I know from that 3 years of experience. All DJI aircraft are subject to compass errors and/or magnetic compass interference when attempting to launch the aircraft directly from or immediately adjacent to a reinforced concrete structure containing rebar, girders, etc. Locations to avoid would include concrete parking lots/patios, concrete driveways, concrete roadways, building roofs, parking structures, and even some concrete sidewalks. Worst case scenario - magnetic compass interference on launch can result in erratic aircraft behavior: random drifting, random jerky movements, the aircraft suddenly taking off full-speed in some random direction, aircraft flipping over on the ground, and/or crashes.
Never, NEVER plan to launch your DJI aircraft from any location subject to magnetic compass interference. If you forget about this issue and try to launch from reinforced concrete, the DJI GO/PILOT app MAY remind you about this issue by displaying Compass Error or Magnetic Compass Interference messages. Heed those warnings seriously -- if you are on the ground, do not take-off; if you are in the air, land immediately -- and find another launch location. Unfortunately, if you take off from or immediately adjacent to a reinforced concrete structure, the DJI GO app may not warn you BEFORE you take off. You may not get this message until you are in the air. Then all hell can break loose. So, avoid getting yourself in that situation.
ALWAYS plan your jobs so that you launch from PREFERABLY a grass or dirt area nearby your job target. Asphalt parking lots and roadways are typically OK so long as there is no reinforeced concrete underneath them. I always bring a 18" diameter plastic launch pad with 4-inch legs, so I can launch from grassy/muddy areas if necessary without soiling my aircraft legs. Fortunately, all DJI aircraft have substantial range capability, so you can almost always find an acceptable grass, dirt or blacktop area to launch from within a quarter mile distance with line of sight visibility of your job target. Just be careful not to attempt to launch from a sod-covered rooftop or underground parking structure - these locations will still have substantial potential magnetic interference.
ALSO, in my experience, once you take off from an area NOT subject to magnetic compass interference, you can THEN safely fly over, fly around and/or land on a reinforced concrete structure with no aircraft stability problems. This magnetic compass interference issue is primarily an issue only during aircraft launch - not after launch or when landing. |
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