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So who calibrated the IMU on the M2P
1811 21 2018-9-4
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Sky Donkey
First Officer
Flight distance : 355157 ft
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So as the title asks..


Who calibrated the IMU on their M2P?

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2018-9-4
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Sky Donkey
First Officer
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I check sensors before every flight in pre checks and see if it needs it.
2018-9-4
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Fraggboy
Second Officer
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I've noticed that the M2P takes a bit longer to fully lock and record the position.  I also check the sensors since the overall page shows when you open up the app.
2018-9-4
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Wachtberger
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You should reword 3. by removing "Yes but,". As it stands I cannot vote because I would only calibrate it when told or after a crash. I had my maiden flight with the M2P today and did not calibrate anything because there was no need to do so.
2018-9-4
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Buzzyone
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Nope. Nor the compass the status of both was ok out of the box.

The Zoom however required a compass calibration.

I work on the basis, don’t introduce problems you don’t need!!
2018-9-4
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Sky Donkey
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Wachtberger Posted at 2018-9-4 11:35
You should reword 3. by removing "Yes but,". As it stands I cannot vote because I would only calibrate it when told or after a crash. I had my maiden flight with the M2P today and did not calibrate anything because there was no need to do so.

dam it it wont let me edit it ....
2018-9-4
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Wachtberger
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Sky Donkey Posted at 2018-9-4 11:38
dam it it wont let me edit it ....

Too bad but there is still option 5. and people can explain.
2018-9-4
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gnirtS
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The dodgy picture confuses people (understandably).

My compass was in the yellow - needed calibrating BUT didnt prompt me.  (But i calibrated anyway as part of my checks before flight).
2018-9-4
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dronist
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Only do it when the app tells you to! Always, make sure you are away from concrete slabs, cars, metal on you or 10' feet radius around you.
2018-9-4
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gnirtS
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dronist Posted at 2018-9-4 12:45
Only do it when the app tells you to! Always, make sure you are away from concrete slabs, cars, metal on you or 10' feet radius around you.

This is the IMU.  You can put it on anything metal for feel like.
2018-9-4
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dronist
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gnirtS Posted at 2018-9-4 12:48
This is the IMU.  You can put it on anything metal for feel like.

Dude, let me make it clearer for you:   

Dude, don't calibrate IMU and or Compass unless the app asks you to do it.

Second don't take off until you make sure you are away from concrete slabs, cars, metal on you or 10' feet radius around you.

Clear enough for you Dude?



2018-9-4
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dronist
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gnirtS Posted at 2018-9-4 11:46
The dodgy picture confuses people (understandably).

My compass was in the yellow - needed calibrating BUT didnt prompt me.  (But i calibrated anyway as part of my checks before flight).

Dude, nope you DON'T calibrate as part of your checks before flight.

Never calibrated any of my drones, and I have plenty of them, even when I went overseas 1000's of mile away. ONLY CALIBRATE when the app ask you to. Even then, make sure you are away from metal, computers etc. so move your AC a few feet or few meters and then turn off / restart and again if it is red and it asked you to do it then you do it.

You don't calibrate out of the blue because you will cause more errors when it is not done right.



2018-9-4
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gnirtS
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And the app doesn't always get it right.  Its got a high tolerance before it tells you to calibrate.

The thread is about the IMU.  The title is about the IMU.  The IMU is not the compass.

Not a single person mentioned compass.

Basically, you got it wrong and now trying to backtrack.

Im also going to assume you're unable to read because regarding the compass the manual clearly states:-


Clear enough for you Dude?  Or would you like it written in crayon using smaller letters?
2018-9-4
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Fraggboy
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gnirtS Posted at 2018-9-4 13:09
And the app doesn't always get it right.  Its got a high tolerance before it tells you to calibrate.

The thread is about the IMU.  The title is about the IMU.  The IMU is not the compass.

Well put!!
2018-9-4
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Hedsic
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This Dronist fella seems like a pretty big c*nt
2018-9-4
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Visual Air
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Hedsic Posted at 2018-9-4 18:24
This Dronist fella seems like a pretty big c*nt

Thats good lol
2018-9-4
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Duncandonut
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I only calibrate the compass or IMU when the app asks me to do so. I do a full pre-flight before every flight and during that, I check both the compass and IMU to see if a calibration is needed.
2018-9-4
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UCBarkeeper
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Hedsic Posted at 2018-9-4 18:24
This Dronist fella seems like a pretty big c*nt

but he is right.
a bad compass calibration is way worse than not calibrating at all.

but yeah, lets keep it about the imu.
2018-9-5
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BlueSkies99
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I only calibrate if the craft asks for it.
2018-9-5
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DJI Tony
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Hi, Thanks for creating this thread for us to know how often they calibrating the IMU. Thank you for the support.
2018-9-6
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hallmark007
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gnirtS Posted at 2018-9-4 13:09
And the app doesn't always get it right.  Its got a high tolerance before it tells you to calibrate.

The thread is about the IMU.  The title is about the IMU.  The IMU is not the compass.

It doesn’t mean the manual is right, when Mavic Pro first manual came out , it said calibrate only when app asks, P4Pro manual says the same spark and inspire2 also the same, there is much confusion about calibration with dji and what it prints in its manuals.
These are digital compass and shouldn’t ever need calibration, I have owned Mavic Pro P4 for over two years I have travelled thousands of miles with both of them, I also own P4Pro , I have never calibrated any of them more than once. If app tells you to calibrate or move, shut down and move, it would be detrimental to calibrate in an area where you are receiving magnetic interference.
It also can cause problems calibrating IMU unless done correctly.
Both of these and their values can be checked in the app and should always be checked prior to flying.

Calibration gives the compass the information it needs to determine which magnetic influences are part of the Mavic and what is the earth's normal magnetic field.
The compass doesn't lose calibration and doesn't ever need re-calibration unless you add or remove equipment to/from the Mavic.


IMU "Inertial measurement unit" .

As far as I see it, IMU calibration on a level surface updates a table of values the flight controller software uses as a reference for a level stationary hover. From there the craft responds predictably to flight commands.  It also likely measures any sensor noise and thermal drift so that these technical imperfections are accounted for when using IMU sensor data in flight. - this is likely why there must be no vibrations during the calibration process.


Bad IMU calibration could cause drift and attitude issues as the flight controller fights to hold the craft in what it thinks is the correct attitude as opposed to the correct physical attitude.


The IMU usually has 2 types of sensors – angle and acceleration and in turn 3 sensors of each type measuring in the X,Y and Z axis. These sensors can, through vibration, aging, impact etc, drift in their response over time and thus an IMU calibration will establish a new reference for the IMU’s level/stationary state that the flight controller can work with to restore stable flight.


Think of calibration as the bringing back into line the measured craft attitude with the true physical craft attitude.


As to how often an IMU calibration is needed, Refer to your manual ; certainly after any impact or if there are suspicions the craft can’t hover in a level attitude in a windless environment
2018-9-6
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Packer Backer
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I did not calibrate it. I don't have it but I swear I read it came calibrated and did not need it out of the box. I do not think I would have not calibrated had I just read it on a forum post.
2018-9-6
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