I've had this problem on some but not all long flights: flying at a constant altitude, the app and log files all show it is doing a great job of maintaining that altitude, but in reality it slowly descends at some point in the flight. Here is a video that shows it, although it's subtle as it happens.
I launch and climb to 325' while flying in a straight line in GPS mode. I fly for just over 4 miles then turn around and fly back. I knew something was wrong because my signal strength dropped but while flying I didn't notice I was actually much lower than what the app said. When I landed at the take-off point, the altitude read 197'. I know from flying here previously to a similar distance that both video and control should be a solid 5 bars at the turnaround point - if flying at 300'. I believe I was really only at about 125'. While I briefly used ATTI mode on the return, it was long after I had lost the altitude and didn't make it worse as far as I can tell.
I am flying with old firmware (1.1.9) and app - Android 1.0.10 on a Nexus 9 with downgraded Google components which has been very stable and lag-free now for almost 100 flights. I might try upgrading once I hear that people are still able to do long distance flights.
Has anyone else noticed this?
Here's the flight on healthydrones.com: HealthyDrones.com - Health Checks for your Phantom
And here's a recording from my tablet:
I launch and climb to 325' while flying in a straight line in GPS mode. I fly for just over 4 miles then turn around and fly back. I knew something was wrong because my signal strength dropped but while flying I didn't notice I was actually much lower than what the app said. When I landed at the take-off point, the altitude read 197'. I know from flying here previously to a similar distance that both video and control should be a solid 5 bars at the turnaround point - if flying at 300'. I believe I was really only at about 125'. While I briefly used ATTI mode on the return, it was long after I had lost the altitude and didn't make it worse as far as I can tell.
I am flying with old firmware (1.1.9) and app - Android 1.0.10 on a Nexus 9 with downgraded Google components which has been very stable and lag-free now for almost 100 flights. I might try upgrading once I hear that people are still able to do long distance flights.
Has anyone else noticed this?
Here's the flight on healthydrones.com: HealthyDrones.com - Health Checks for your Phantom
And here's a recording from my tablet: