My mavic would return at prescribed attitude home but at home point, it would start ascending again until I pause or cancel the return home function and land it manually. Does anybody else have this problem?

Disable the vision sensors and try again the rth, if then it works as expected your ground sensors are not working properly, you can try to calibrate and check again. If that doesn't work you'll have to ask for a replacement.

I'd suggest to pull your logs and open a case already.

Pandakev, may I know have you contacted our tech support to create a case and provided the flight log for evaluation by engineers?
If so, may I have the case number?

I had the same issue yesterday.  I used RTH after losing line of sight.  The home point was directly into the sun.  I believe the Mavic interpreted the sun as an obstacle due to the forward obstacle avoidance being enabled and blinded.  My Mavic ascended well above the altitude limit I had set.  I had to cancel RTH and descend to approx 200 ft AGL before regaining line of site and manually bringing the Mavic back to home.

Is it normal for the Mavic to ignore the altitude limit when the RTH path is "obstructed"?

Same thing for me today.  Sun low in the sky, and I lost visual contact.  Drone at 200+ ft and kept getting obstruct warnings.  Was flying into the sun.  When I RTH it started to ascend, over the 400' max.  I canceled and managed to manually bring it back close enough for visual contact.  A bit scary.

Yes, if the OA is sensing the sun as an obstacle then it will just continually climbing well past RTH height and well past any set maximum height. It just ignores them all. Lots of people have this problem. Just stop RTH and fly home manually.

Jenee 2 Posted at 2017-2-20 23:08
Yes, if the OA is sensing the sun as an obstacle then it will just continually climbing well past RTH height and well past any set maximum height. It just ignores them all. Lots of people have this problem. Just stop RTH and fly home manually.

Does the app show the OA warnings and radar arcs on the screen when this happens in RTH mode? That should be an easy way for people to know if OA is the culprit or not.

Jason Lane Posted at 2017-2-21 00:18
Does the app show the OA warnings and radar arcs on the screen when this happens in RTH mode? That should be an easy way for people to know if OA is the culprit or not.

It does show alerts. I think the app also provides some haptic feedback when OA kicks in, but I can't be 100% sure about that.

I tend to watch height and distance readouts while RTH to keep on top of what's happening.

Had this happen to me yesterday for the first time, realized the flight path was headed towards the sun, so I took over control and flew manually at a diagonal for a bit until I could get the altitude low enough not to be bothered by the OA false-positive. The video is amusing, really looks like I keep bumping into an invisible wall.

Jason Lane Posted at 2017-2-21 00:18
Does the app show the OA warnings and radar arcs on the screen when this happens in RTH mode? That should be an easy way for people to know if OA is the culprit or not.

Sometimes you see the OA arc but sometimes it does not show. When you experience one of these episodes, you tend to be watching the drone as it brakes, climbs, brakes etc to make sure you know where it is to get it under control again.

Jenee 2 Posted at 2017-2-21 21:47
Sometimes you see the OA arc but sometimes it does not show. When you experience one of these episodes, you tend to be watching the drone as it brakes, climbs, brakes etc to make sure you know where it is to get it under control again.

And do those OA warnings show up in the flight record when you play it back? I'm just trying to figure out if there's an easy way that users can tell whether OA is the cause, or if it's the same bug in RTH that I was experiencing before the latest firmware.

Jason Lane Posted at 2017-2-21 22:04
And do those OA warnings show up in the flight record when you play it back? I'm just trying to figure out if there's an easy way that users can tell whether OA is the cause, or if it's the same bug in RTH that I was experiencing before the latest firmware.

No warnings show in the Healthydrones flight records. I never had any problems with the previous firmware and now I am really confused because I have just changed from Android phone to an IPad Mini 4 and I haven't yet had the problem while using the iPad. Go figure?

I thought that it disables the obstacle avoidance during RTH? I assumed it was for this reason. I always see "obstacle avoidance disabled" whenever RTH is activated. You should just set the RTH correctly so there is no risk of hitting an obstacle.  

geofox784 Posted at 2017-2-22 06:34
I thought that it disables the obstacle avoidance during RTH? I assumed it was for this reason. I always see "obstacle avoidance disabled" whenever RTH is activated. You should just set the RTH correctly so there is no risk of hitting an obstacle.

I think you are seeing "Obstacle avoidance will be disabled in landing" messages -- I think this means OA is active on the RTH, but disabled on landing since the Mavic knows the condition of the landing area?

Ex Machina Posted at 2017-2-21 09:11
It does show alerts. I think the app also provides some haptic feedback when OA kicks in, but I can't be 100% sure about that.

I tend to watch height and distance readouts while RTH to keep on top of what's happening.

Welp, looking at my flight log (phantomhelp and healthydrones) I actually don't see any warnings. Weird. Now I'm questioning my recall.

Ex Machina Posted at 2017-2-22 07:13
Welp, looking at my flight log (phantomhelp and healthydrones) I actually don't see any warnings. Weird. Now I'm questioning my recall.

What about the flight playback in DJI GO?

Jason Lane Posted at 2017-2-22 07:15
What about the flight playback in DJI GO?

Looked there, too. For some reason flight playback doesn't display any of the alerts, at least on the iOS version of the app. Unless I'm overlooking something?

Ex Machina Posted at 2017-2-22 07:23
Looked there, too. For some reason flight playback doesn't display any of the alerts, at least on the iOS version of the app. Unless I'm overlooking something?

There is a recording in the app that shows all warnings, and flight dates.

Just go to equipment click on enter device, in right hand corner 3 dots click scroll down 3 from the end WARNINGS click your flight date this will give you a list of all warnings for required flight...

Jenee 2 Posted at 2017-2-20 23:08
Yes, if the OA is sensing the sun as an obstacle then it will just continually climbing well past RTH height and well past any set maximum height. It just ignores them all. Lots of people have this problem. Just stop RTH and fly home manually.

In relation to this ... After RTH to the proper ground coordinate - before landing - the Mavic will rotate to the take-off compass direction before descending.  If that direction is facing the sun, it might ascend or just hover.  Try your take-off with the Mavik pointed in another direction.

there are two settings for disabling collision avoidance. click the three dots in the upper right hand corner of the app. then select the radar looking icon (second from top) on the left hand side.  Diable "enable obstacle avoidance" on that screen, then scroll to the bottom of the same screen and go to "advanced settings".  In there, turn off the "RTH OBSTACLE CHECK"  

hallmark007 Posted at 2017-2-22 07:29
There is a recording in the app that shows all warnings, and flight dates.

Just go to equipment click on enter device, in right hand corner 3 dots click scroll down 3 from the end WARNINGS click your flight date this will give you a list of all warnings for required flight...

Ahh, thanks, there is the obstacle detected alert!

Weird that this isn't also presented in the Flight Playback tool.

Ex Machina Posted at 2017-2-22 07:58
Ahh, thanks, there is the obstacle detected alert!

Weird that this isn't also presented in the Flight Playback tool.

You would think it should, it's a good tool to check after your flight, I also see redundant compass warnings appear on this, which I presume means , compass has switched to second compass because of interference.

fans90d4f438 Posted at 2017-2-22 07:49
there are two settings for disabling collision avoidance. click the three dots in the upper right hand corner of the app. then select the radar looking icon (second from top) on the left hand side.  Diable "enable obstacle avoidance" on that screen, then scroll to the bottom of the same screen and go to "advanced settings".  In there, turn off the "RTH OBSTACLE CHECK"

Android? I don't see this option on IOS. No advanced section on Visual Navigation Settings.

Ex Machina Posted at 2017-2-22 07:58
Ahh, thanks, there is the obstacle detected alert!

Weird that this isn't also presented in the Flight Playback tool.

I remember seeing those alerts before but they seem to be gone. Not seeing any alerts in flight playback anymore. I can see them in the healthydrones data though.
Edit: Tried again, but instead of scrolling through it quickly if you play it back at 1x, 2x, 4x, or 8x speed they will show up.

Reviewing the HealthyDrones data I can see that the "Obstacle Avoidance will be disabled in landing." warning wasn't activated until it was over the landing area.

Griffith Posted at 2017-2-22 07:36
In relation to this ... After RTH to the proper ground coordinate - before landing - the Mavic will rotate to the take-off compass direction before descending.  If that direction is facing the sun, it might ascend or just hover.  Try your take-off with the Mavik pointed in another direction.

I agree but when you first get a Mavic, there is no big poster in the box to tell you not to takeoff into the sun or RTH into the sun.

fans90d4f438 Posted at 2017-2-22 07:49
there are two settings for disabling collision avoidance. click the three dots in the upper right hand corner of the app. then select the radar looking icon (second from top) on the left hand side.  Diable "enable obstacle avoidance" on that screen, then scroll to the bottom of the same screen and go to "advanced settings".  In there, turn off the "RTH OBSTACLE CHECK"

Yes I am aware of those settings now but turning one or both off is like putting a bandaid on a software problem. If we all make adjustments to get around the problem it will never get fixed. As I have said before, I never had the problem with the previous firmware.

Jenee 2 Posted at 2017-2-22 17:17
I agree but when you first get a Mavic, there is no big poster in the box to tell you not to takeoff into the sun or RTH into the sun.

It's not generally a  problem unless the sun is very bright.  In any event, you can manually rotate the drome 90 degrees and manually land or just hit the "land" button on the RC.