Thanks again guys; Cahutch and M. Tigelarr for your repsonses...
In the beginning, my height is pretty good (+\- 0,5 meter) but if you wait on the ground the altitude go's up (3 to 5 meters) :shock:
It seems to be a tempeture thing.
M. Tigelarr, this is what I was wondering, perhaps the variables in reported height from my phantom aren't really unusual. But again, there is very little information about this on the discussion boards and nothing in the manual about this.
cahutch, thanks as well for your detailed information about this. Just to be clear though, on my 6th flight (the one before todays), I was trying to land my bird manually and directly on the ground, like I always have. You mentioned "auto landing" sequences and how the software should behave. Just wanted to be clear that on this 6th flight, I was attempting to land my bird manually.
Here's the 60 second video clip from that landing. You will see it bounce erratically and violently when I was attempting to do a manual landing. After seeing this, I raised her up and then landed her a few feet away without incident. And like I've mentioned, I've never had a problem like this before and with manual landings.
[youtube]https://www.youtube.com/watch?v=eC17-_J1-Qo[/youtube]
I wonder if this was just an anomaly and not a concern. Again, I'm mostly wondering about the 15-20 foot differential in reported height by the DJI app.
Thanks everyone for the responses and I'm going to try 8676309's suggestion and manually reset my home position while on the ground before my next take off and see if that helps.
BTW, I never expected that the telemetry would be bang on with a RC UAV, but regarding height stats, I assumed that these were a little more important for a RC helicopter.