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Almost crashed at my first flight.
2402 31 2016-10-31
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giusis00
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Italy
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I am a P3P owner, I just bought the Mavic, so I have some experience with the DJI drones.

At my first flight (outside) I waited for the GPS lock (it reported more than 10 sats in view), right after i took off it started to warn me about the weak GPS signal.. I didn't care too much coz I was in full control (ATTI).

I flight for 8 minutes (in a confined 2mx2m area) then I moved apart 10 meters... the Mavic suddendly jumped up in the air (it activated the RTH function), then it started to fly at speed near the launch point, but it was off by a couple of meters... for a matter of lucky it landed (tried to) in the mid-high grass.. the props cut the grass but luckily it didn't crashed... the whole time I had no control of the drone neither i couldn't do anything (there was no RTH to cancel)... then suddendly it accepted my left stick up and it gained some height, I finally was able to move out from that point and land in a safety place.

I can understand that I wouldn't had to flight with a full GPS lock... but I never experienced a similar issue with my P3P. Not having the possibility to control the drone while doing it's own things is scary as hell.. it could have landed anywhere.. on the house roof, on my car.. or whatever it had down to it.

Please do something with the software... having a no controllable drone is not acceptable. I rewieved the log on my phone and the path from when it went crazy and the launch point is like a "jump" (probably due to the reported weak GPS signal), while it actually flight there, then I see the message: "Aircraft is close to home point. Return to home mode is now auto landing mode".

I will upload the flight logs asap...

2016-10-31
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DrVee
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Australia
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Following thread
2016-10-31
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DJI Mindy
Administrator
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I'd suggest you to sync your flight records and send an email to support.eu@dji.com with your DJI account email and the date this occurred.
They can analyze the data and let you know what could have caused the issue.
2016-10-31
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wing
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Canada
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DJI Mindy Posted at 2016-10-31 19:32
I'd suggest you to sync your flight records and send an email to  with your DJI account email and  ...

following thread
2016-10-31
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HjM4qzGDMUeQ
lvl.3

United States
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Subscribing
2016-10-31
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ku44WFUTyoxJ
lvl.2

United States
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IOS or Android?
2016-10-31
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giusis00
lvl.2

Italy
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Android (Honor 8).
2016-11-1
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giusis00
lvl.2

Italy
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DJI Mindy Posted at 2016-11-1 03:32
I'd suggest you to sync your flight records and send an email to  with your DJI account email and  ...

Tnx, emailed.
2016-11-1
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giusis00
lvl.2

Italy
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They asked to me for the flight log.. but I can't see where they are? I enabled the "Enter Flight Data Mode" but when I connect the USB I only see the SDCARD contents?
2016-11-1
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Sploodge
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giusis00 Posted at 2016-11-1 15:24
They asked to me for the flight log.. but I can't see where they are? I enabled the "Enter Flight Da ...

Need to install the DJI Assistant 2 software

https://www.dji.com/mavic/info#downloads
2016-11-1
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giusis00
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Italy
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Tnx.. upped.
2016-11-1
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giusis00
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Italy
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DJI Mindy Posted at 2016-11-1 03:32
I'd suggest you to sync your flight records and send an email to  with your DJI account email and  ...

Here's the link to the flight log:

https://mega.nz/#!gV82QDhC!AlVpKIHyaWjrOtqpy0cM9i0FWf98tAb50Gn4q2TVLdA
2016-11-1
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DJI-Ken
DJI team
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The RTH procedure is different now verses the P3/P4. With the P3, if a RTH is triggered within 20m of the home point the aircraft descends.
With the Mavic between 5-20m it it ascend to the RTH altitude, then come home.
Within 5m it just descends like the P3 does within 20m.
So if the RTH was triggered by you or a low battery then the aircraft did what it was supposed to do.
If it went into RTH on it's own and you didn't trigger it and you had plenty of battery then it could be something.
Different RTH procedures than P4.JPG
2016-11-1
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Jonathan DesJar
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Were you in OPT? Should' have Sat lock to my understanding if you were in that mode. Maybe somebody with the Mavic can comment
2016-11-1
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giusis00
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Italy
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DJI-Ken Posted at 2016-11-1 17:31
The RTH procedure is different now verses the P3/P4. With the P3, if a RTH is triggered within 20m o ...

Yes I wasn't the optimal flight conditions and in fact I'm not blaming it for not perfect flight: night (with artificial lights) and apparently weak GPS signal (whenever it was outdoor, so this last bit was a little strange, it reported more than 10 sats up to 17).

What scared me is that he suddenly went into RTH without announcing any RTH on the remote or on the mobile display, it just did it by its own mind and I couldn't do anything (controlling it or cancel the non-existant RTH on the remote).

The second issue was about how it tried to land. According to the manual without a precise GPS fix it shouldn't attempt to land but hover at 0.5 ... instead it descended at a very fast speed (like it did those 30 meters in 2 seconds), but 2-3 meters apart from the starting point, in a non suitable spot for landing, so it touched the terrain (cutting the grass) then I finally regained the control and landed it safely.

Luckily nothing got broke.. neither the props.. but I don't think I'm going to fly again the bird until the case is examined and they will tell me, why it went in RTH and why I couldn't cancel it.
2016-11-1
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trance728
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Much of these things wouldn't be as serious if they included a damn switch for ATTI.
2016-11-1
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fansca914a22
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giusis00 Posted at 2016-11-1 19:14
Yes I wasn't the optimal flight conditions and in fact I'm not blaming it for not perfect flight: n ...

giusis, in which city of Italy are you?
2016-11-1
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giusis00
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Italy
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fansca914a22 Posted at 2016-11-1 19:18
giusis, in which city of Italy are you?

I'm around Naples.. but I normally live in Spain.
2016-11-1
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DJI-Ken
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giusis00 Posted at 2016-11-2 02:14
Yes I wasn't the optimal flight conditions and in fact I'm not blaming it for not perfect flight: n ...

What is your case#?
And what page in the manual do you see it will hover at .5m without GPS.
2016-11-1
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giusis00
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Italy
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DJI-Ken Posted at 2016-11-1 19:42
What is your case#?
And what page in the manual do you see it will hover at .5m without GPS.

CAS-306600-G8R4V1

It was about the landing protection (Page 13). Reading it again: if it's determined that the terrain is not suitable for landing, it won't land but it will hover 0.5m waiting for user input. The question is: how it decides if the terrain is suitable for landing...
2016-11-1
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giusis00
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Italy
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Last moment during the descent, I didn't uploaded the whole flight because it was almost black... as I mentioned it was night and the cam was dark and not in focus, I piloted the drone by sighe at some meters from me. The descending speed wasn't fast as I believed initially, but deffo faster than what you may call it "gently landing". I believe the whole thing happened because the sensors was fooled by the low light conditions etc... but this is the main reason of why the non cancellable RTH was so scary.
At the end of the video, after the "bouncing" on the terrain you see I regained the control and landed it in the original starting point.

2016-11-1
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hedfan
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trance728 Posted at 2016-11-1 18:17
Much of these things wouldn't be as serious if they included a damn switch for ATTI.

Allow the P-mode and S-mode switch to be customisable, so we use it to force ATTI mode instead of Sport mode
2016-11-1
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DJI-Ken
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giusis00 Posted at 2016-11-2 02:51
CAS-306600-G8R4V1

It was about the landing protection (Page 13). Reading it again: if it's determ ...

I'll look at your flight record. Is the email in the case# the one you use for the GO app and are the flight records synced to the DJI cloud?
Also, I don't see that on page 13. I'm looking at the US manual from the website.
2016-11-1
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giusis00
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Italy
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DJI-Ken Posted at 2016-11-1 20:42
I'll look at your flight record. Is the email in the case# the one you use for the GO app and are  ...

Yes it's the same email.
It's at pag.14 (section .3).
2016-11-1
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EpicLPer
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giusis00 Posted at 2016-11-1 20:05
Last moment during the descent, I didn't uploaded the whole flight because it was almost black... as ...

Besides that the camera seems really out of focus on the outside and in focus a bit to the left center...
What's with all those camera issues? I'm now concerned that mine will be damaged too...
2016-11-1
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giusis00
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Italy
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EpicLPer Posted at 2016-11-2 07:55
Besides that the camera seems really out of focus on the outside and in focus a bit to the left ce ...

I didn't focused the camera at all, It was flying near to me... I recorded the video just to test if the recording were working. The camera is fine in normal light conditions (and when in focus).
2016-11-1
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fans52525230
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Following this thread
2016-11-2
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braddahjosh808
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I wonder if it's an issue with the new OccuSync technology losing connection with the drone which would then activate the RTH?
2016-11-2
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A.C.E.
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Germany
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following for updates
2016-11-2
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Anoniem
First Officer
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Hi DJI Ken, we all would like to know what is happening. Any information you can share?
2016-11-3
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fans92c4062f
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Subscribing.
2016-11-3
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Nomadic
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no RTH to cancle -- did you click the RTH button and it just wouldn't respond?
From the user manual, during RTH you can only control the throttle and pitch when the vision system trying to work (you can't turn or move sideways so mavic can only go forward, it has obstacle sensing only in the front), so maybe this is how it works and not a problem?
2016-11-3
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