HedgeTrimmer
Captain
United States
Offline
|
Not unusual. Something to be aware of. Because concrete may be reinforced with steel mesh or rebar, the placement of drone can change whether internal compass is barely effected to severely effected.
Having done enough testing involving rebar in concrete - you can move drone left or right, forward or backwards, and even rotate drone - and change how much compass is effected.
Best thing to do is not use concrete sidewalks, driveways, streets, picnic tables, dock piers, etc. as takeoff / landing areas.
There are two ways to check for sources of magnetic interference.
One way is using Free / Cheap Apps available for both iOS and Android phones and tablets.
Example of two such Apps: App #1 App #2
Apps will show deviations in Earth's magnetic field whether source of magnetic field is acting as shield (metal sided building) or generating field (static like magnetic or dynamic like buried power line).
If you observe any major field strength changes upwards or downwards, usally reported in Gauss or µT (micro Tesla), you avoid that spot as possible takeoff point or area for compass calibration. If you are going to takeoff from within that area, last step is to check your chosen takeoff spot. Done by lowering Smartdevice down to ground, then moving smartdevice around spot looking for any changes from what you previously observed over the area.
Other way is use GO-4 App to look at drone's detected interfence levels for compass(es).
An issue with this method as a pre-check for magnetic infereence is you are using device (aka drone) that is in need of calibration.
Under main menu of GO-4 App - in middle at Top of Screen - Tap on QuadCopter Icon
At bottom of MC Settings screen - Tap on Adance Settings
At bottom of Advance Settings screen - Tap on Sensor State
At top of Sensor State screen - Tap on Compass
Below Interference, you should see two compasses for Mavic Pro, and one compass for Mavic Air
Blue dot next to Compass (1 or 2) indicates which one is being used in case of Mavic Pro
You want to see short 'Green' bar(s). {You do not want to see 'Red' bar(s) at all. And it is best you do not see 'Yellow' bar(s). Which indicate interference}
|
|