HedgeTrimmer
First Officer
United States
Offline
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cutis Posted at 3-11 07:47
to all above compass edifies, hedge and hall speak of contending with the situation by regimented ritual procedures. the sad part of all of this trouble with takeoff compass nagging is the proximity area for takeoff likely is the culprit (EMI and or ferrous). and you have to BELIEVE your drone indication of it.
sad, sad, sad, because here is where you'd like to launch to acquire that priceless cinemaphotography, but launchpad is locked out by ferrous and or EMI bombardment.
too bad mavic can not via waived exception, rise to hover, probably escaping such vicinity EMI and or ferrous, then ascertain coordinates for home and navigation
Please don't lump me in. I have spent lot of hours testing and experimenting with sources of magnetic interference impact on earth's magnetic field and electronic compasses (drones and smart devices). My first Mavic Pro Platinum was nortorious for whinning about it's compasses needing calibration. So bad, I got to where I would do one calibration for day, and ignore any more whinning about compasses. After I switched from iPhone / iPad to using a CrystalSky monitor, those false indications stopped. Chalk it up to differences in GO-4 software between iOS & DJI's version of Android, I don't know.
Unfortunately, there has been a lot of F.U.D. or Internet grapevine advise on issues of Magnetic Interference. As in, first person says several inches, then next person adds several more inches for ''safety'', and next person goes with advise of a foot (just to be sure), and so forth. What is rarely mentioned, is effects of magnetic interference, rapidly decreases as distance from source is increased. One only needs to hold a strong magnetc a foot away from a piece of steel, then start moving magnet towards steel to experience the effect. With Reverse, pulling magnet off steel, to confirm.
As such, Mavic drone does not need a "waived exception". When all it usually takes is moving Mavic drone a short distance on ground. When entire area is effected due to say steel mesh or rebar in concrete, slightly elevating Mavic drones launch / landing pad has been more than enough to stop whinning about compass calibration or change compass field strength bars from Red / Yellow to short Green bars (Good to Go).
In regards to ''you have to BELIEVE your drone indication of it''...
Magnetic Interference Apps I alluded to, like GaussTesla Meter or Tesla Recorder, can be used to decide if drone compass(es) is indeed detecting magnetic interference from a nearby source, or if drone compass(es) are giving a false warning (false positive). Leading to possible causes of compass(es) need calibration, drone needs degaussing, possibly a firmware/software problem, or there is a hardware problem involving electronic compass(es) (X,Y,&Z magnetic field strength sensors). Whether someone chooses to use such Apps is up to them. But I see Apps as no different than any of ofther Add-ons, be it Litich software, Firehouse strobes, or Antenna boosters.
There has also been mention of TBE (Toilet Bowl Effect) in relation to sources of magnetic interference. Even though there are videos of drones suffering from TBE, what has not been shown is actual cause. Between Magnetic Interference being invisible to naked eye and Lore surrounding Magnetic Interference, to many people have assumed TBE was result of ferrous metal in vincity of drone. In none of videos does anyone verify whether drone's compass(es) were malfunctioning, compass(es) had shifted position inside drone, or drone's compass(ese) had been calibrated correctly prior to demonstrating TBE.
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