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What will happen to your MAVIC when: Lost GPS, On/Off VPS,...
4532 26 2016-10-28
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Nees
First Officer
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So lets start this topic here about cases that might happen.

I copy paste here my last post that was offtopic, and DJI Ken asked to start a new thread, because this needs some clarification.

Example:

Fly in a canyon. Will it count as NEGATIVE altidude from the point where you took off, so when GPS is LOST  and VPS is active, can we get it out since it is negative and +5m or +50m  is the max?

Also, Sports mode disables VPS I think... So, will that save it? I really would like an answer to that.

I have also been wondering, if you go behind something that is higher  then 50m, and also lost GPS. The drone will forever stay on the other  side? How do we fix this? What settings, setup, switches do we change to  get it back over the obstacle?

I would like to see a clarification from DJI that gives examples what will happen in what cases. I find the manual to be confusing.

If other have examples of what could happen... Lets figure it out.

2016-10-28
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giusis00
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- May I start a flight indoor without GPS lock? And what happens if it suddendly regain the GPS signal?

- May I fly with unreliable GPS signal? In example in a forest with tall trees.. how the drone reacts to a continuos GPS signal loss?
2016-10-28
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hallmark007
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I'll answer one of your questions, your zero height is taken from the home point were you took off , so yes if you fly into a canyon you will have a minus height,
I really think you should take a second look at the manual, some of the terms you use are wrong i.e., VVS , GSP these are fairly simple to learn it's VPS AND GPS ,
2016-10-28
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Nees
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hallmark007 Posted at 2016-10-28 21:30
I'll answer one of your questions, your zero height is taken from the home point were you took off , ...

GPS is a typo, VVS is because I saw DJI-Ken use it also, just took it over. I know it is Visual Pos. System.
2016-10-28
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Jake Phantom 3
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On your flight if you end up behind a tall object, it'll return home as long as you have your return home height taller than what you are behind. Flying indoors without GPS is no problem because there would be no wind inside and the Mavic is very steady. But make sure you are in tripod mode. If you do get GPS, it shouldn't change anything, it'll still be stable. At least this is how I understand it.
2016-10-28
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giusis00
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hallmark007 Posted at 2016-10-28 21:30
I'll answer one of your questions, your zero height is taken from the home point were you took off , ...

Excuse me, but I want an answer from DJI to those specific questions, since it has been proven already that the manual is wrong (due to the changes in the firmware).

So, unless you work for DJI, you should keep quiet and let them to reply.

Excuse me if I'm too rude, but I have enough guessing and theory from random internet specialists... while I want a official reply from DJI, so if the drone doesn't do what they claim it should do and I crash my expensive bird, I have an evidence that they stated the wrong and I haven't spend more money for another expensive drone.
2016-10-28
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hallmark007
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giusis00 Posted at 2016-10-28 20:53
Excuse me, but I want an answer from DJI to those specific questions, since it has been proven alr ...

I didn't answer any of your questions nor would I your ignorance knows no bounds, thank you good by..
2016-10-28
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hallmark007
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Nees Posted at 2016-10-28 20:40
GPS is a typo, VVS is because I saw DJI-Ken use it also, just took it over. I know it is Visual Po ...

I'm sorry if I sound a bit rushed with you, but you will find re reading the manual will help, it's the one thing dji keep harping on about.
2016-10-28
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Anoniem
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giusis00 Posted at 2016-10-28 21:53
Excuse me, but I want an answer from DJI to those specific questions, since it has been proven alr ...

Giusis00, indeed you are rude.
This is a forum, we all can talk whatever we like to do.. please do not read it if you do not want to read it.
A healthy discussion can provide us with more answers at the end from DJI, I think it can be very effective and useful for a lot off people.
Perhaps you have some other questions, ask them, I'm interested in reading your input
2016-10-28
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djoole
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Ken's last statement is contradictory with the one he gave me :

He told me the drone, if GPS is lost, and if it's above the height limit according to its settings (50 meters with DVS off, 5 meters with DVS on), will still be fully controllable except the elevation, you will be able only to descend.
Fair enough.

But later he answered giusis00 that there was no limit, full directional and altitude control even at 500m...

This also needs to be clarified, even if I'm ok with answer 1.
2016-10-28
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giusis00
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Anoniem Posted at 2016-10-28 22:12
Giusis00, indeed you are rude.
This is a forum, we all can talk whatever we like to do.. please do ...

People are writing what they believe it's the truth (or supposed to...). Here we need confirmation from DJI, because there's people already crashing their drones due to this, and honestly after all this wait and 1500€, I don't wanna crash mine, this is why I want answers from DJI and not from random internet experts.
2016-10-28
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ecophobic
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I usually don't jump on other people's "arguments" but to the Original Poster: if you wanted a direct answer only then I suggest you do a direct contact via email (so you can have it in writing for your records). Posting such a question on a FORUM is similar to posting it on cork board or telephone poll on a corner (and getting upset when random people reply). Besides that I think it's a good question at least for us new to this in general.
2016-10-28
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method007
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giusis00 Posted at 2016-10-29 04:21
People are writing what they believe it's the truth (or supposed to...). Here we need confirmation ...

The people on this board are moderators, they do not have the final say on how the Mavic operates.  You need to contact support.
2016-10-28
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giusis00
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method007 Posted at 2016-10-28 22:24
The people on this board are moderators, they do not have the final say on how the Mavic operates. ...

This is not true, we are having DJI internal staff posting here (look at the Crash thread where at least two DJI workers are asking for the log files).
The support? You are missing the fact that this is the DJI support forum, if we can't have the correct answers here, where we should post our questions? On reddit?
2016-10-28
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djoole
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We ask the questions here and not by email to the support, so that everybody can take advantage of the answer... but indeed the answer needs to come from DJI.
Answers that are not in the manual are needed, not suppositions from future users (no offense).
2016-10-28
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Jenkins
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This is concerning to me. A new user awaiting delivery. I was looking forward to a situation where I could lower the drone below a cliff face. Should I have VPS enabled or disabled? If GPS is lost will it be stuck?

Slightly OT but does anyone have the link to the manual?
2016-10-28
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va3fjs
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giusis00 Posted at 2016-10-28 16:21
People are writing what they believe it's the truth (or supposed to...). Here we need confirmation ...

This is a forum and everyone has a right to speak up. If you want an answer from DJI, then I suggest you write them or call them and get the answer that way. If you pose it here, then expect people with experience or opinions to speak up. It is their right just as it is everyone's right to expect courteous discussion.
2016-10-28
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hallmark007
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Jenkins Posted at 2016-10-28 22:27
This is concerning to me. A new user awaiting delivery. I was looking forward to a situation where I ...


You should have VPS enabled, the only time you might be better to disable VPS is when flying low over water , this is because the water maybe flowing and VPS has trouble recognising this,
You are welcome to get a second opinion on this but it will be the same,

Sorry you asked another question if gps is lost you drone will go into Atti mode and you will be able to control it with the sticks, so long as it is in line of sight as it should allways be,
2016-10-28
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DJI-Ken
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djoole Posted at 2016-10-29 04:15
Ken's last statement is contradictory with the one he gave me :

He told me the drone, if GPS is los ...

I'm sorry if it's confusing and I sent a message for clarification.
Max altitude with no GPS it's 50m with DVP  enabled and 50m with DVP disabled. (sorry if I mis-named it, I'm used to it being called VPS)
That is from when you take off and those altitudes are from the take off point.
If you are higher than that and lose GPS you have full control of the aircraft but cannot ascend any more until you have GPS lock.
So if you take off from the side of a mountain an descend into it and lose GPS, you can climb back up to to your take off altitude and go to 5m if DVP is enabled or 50m if DVP is disabled. This is the question I sent to verify but I'm pretty sure that's how it works.

Now if you are at the bottom of a mountain and climb up and over the hill and down the other side (descending over 50M) and lose GPS after you've descended then if it the altitude limit is measured from the  home point then you will not be able to climb over the top. But regardless, I think you would lose RC signal and it would go into RTH anyways and you will be fine as long as you set the RTH altitude higher then the top of the hill.

2016-10-28
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giusis00
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DJI-Ken Posted at 2016-10-29 00:19
I'm sorry if it's confusing and I sent a message for clarification.
Max altitude with no GPS it's ...

Thanks, this is much better! If the ZERO is always the starting point, then you should be able to always reach the starting altitude (unless there's an obstacle between).
So here's the second question: if you lose the GPS .. how this altitude is calculated after (to determine those 5m or 50m)? And what happens if the zero (saved) altitude was set wrongly?
So even if the situation is much better.. we still miss a fall back feature that will give us a way to override what the computer believes it's the real value.
I mean we have people that have driven their car into the ocean because their GPS said that was the right way... that's a stupid human of course, but if you leave the computer drive your car into the ocean without giving to the pilot a possibility to override its decision, this is even more scary.. and that's what happening here: please push your company to update the firmware, giving to us a way to control the drone manually in ANY moment, unfortunately a computer is not smart enough (yet) to keep the best decision in every circumstance.
2016-10-28
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giusis00
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va3fjs@rac.ca Posted at 2016-10-28 23:34
This is a forum and everyone has a right to speak up. If you want an answer from DJI, then I sugge ...

Stop blabbling.. we're asking questions here so people can take advantage of the reply from DJI staff. Those are important matters that involves all the Mavic owners, we're not asking about personal things.
It's explained 3 posts above yours already.
2016-10-28
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Handsfreebicycl
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giusis00 Posted at 2016-10-29 06:47
Thanks, this is much better! If the ZERO is always the starting point, then you should be able to a ...

I think they have other concerns giving out the pilot whole control of the aircraft at anytime because that way all the restricted areas dji has specified will lose their meaning...

I could easily be wrong but I strongly doubt that they will give you right to fully control the drone at ANY time
2016-10-28
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Babblin5
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The answer is: The Apocalypse will happen.
2016-10-28
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Nees
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giusis00 Posted at 2016-10-29 00:47
Thanks, this is much better! If the ZERO is always the starting point, then you should be able to a ...

It has a barometer for height then.
2016-10-28
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DJI-Ken
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giusis00 Posted at 2016-10-29 06:47
Thanks, this is much better! If the ZERO is always the starting point, then you should be able to a ...

There's still the barometer in the aircraft and I'm guessing it knows your altitude throughout your flight.
The GPS and barometer are used for altitude.
2016-10-28
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djoole
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DJI-Ken Posted at 2016-10-29 00:19
I'm sorry if it's confusing and I sent a message for clarification.
Max altitude with no GPS it's ...

Thanks a lot Ken for this clear answer!
Now we know what to expect. To me it's a nice behavior.

Please keep us updated if the guys you asked confirmation about the gps lost behavior tells you otherwise!

To people complaining about us asking for DJI staff answer, I think it's only normal, as it is question about something than anyone else doesn't know about. And now we have the answer (waiting to be validated).
I'm all for sharing and discussing opinions don't misunderstand me ;-)
It's just that for this matter I wanted a rock solid answer.
2016-10-28
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djoole
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Hi Ken,
Did you get confirmation about the above stuff?
2016-11-1
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