I have a Phantom 3 standard. I'm currently touring in northern Vietnam and while trying to ascend a waterfall I was blocked shortly before reaching the top by the altitude limit. I currently have it maxed out at the 1000m limit. How can I still have P-GPS mode above 1000m?

You can't

The altitude restriction is 500 meters and cannot be changed higher than that.

DJI-Ken Posted at 2015-12-18 09:56
The altitude restriction is 500 meters and cannot be changed higher than that.

however, and please correct me if I am wrong. the altitude set in DJI Go is based on your home point being 0 (meters or feet) and not current altitude above sea level. if you are at 980m (3215 feet) altitude and it's stopping. you might be in beginner mode which limits altitude and radius.

if the app used altitude above sea level, then we would be limited to valleys, foothills only. and never I the mountains.

I think you are ok. check your settings

safe flying

I have it set to 500m, which is the limit. It doesn't matter though, the problem is still the same.

It does not use the home position is 0m. If you start at 480m and try to gain more than 20m of altitude it will hit the limit.

Obviously, obviously it should not be interfering in this case. How can I still have P-GPS mode above 500m?

If you are seeing a problem like that then try deleting the app and re-installing it.
if you are standing on top of a 2000m mountain and you power up the Phantom, it will still be able to fly up 500m. If it is not working that way and you have "Beninner Mode" off and you have the "Set maximum flight altitude" set to 500m then your unit has a problem and you need to send it in for repair.

David_ Posted at 2015-12-19 19:53
I have it set to 500m, which is the limit. It doesn't matter though, the problem is still the same.
...

imho doesn't matter at all wherever you are. just re-calibrate the compass and you will gain another (upto) 500 meters (max) of height to fly. it's basically that simple. always re calibrate the compass whenever you get reasonably higher or lower than where you flew before; whether it's on top of a building or a bridge or a mountain or wherever.

Dody Posted at 2015-12-24 04:51
imho doesn't matter at all wherever you are. just re-calibrate the compass and you will gain anothe ...

That is likely what happened. I just happened to not have time to recalibrate on that flight so it based my altitude limit off of the previous flight.

The max altitude is relative. No problem taking off from 2800 meters and adding to that...

Also remember that the higher you are in elevation, the thinner the air and your motors will have to spin faster to stay in the air. Your flight times will be drastically reduced and people often think it's a problem with the batteries.

topleader Posted at 2016-1-8 11:20
Also remember that the higher you are in elevation, the thinner the air and your motors will have to ...

i think the OP figured out his situation, the hight limit is based on AGL, not MSL.