Altitude reading off

[exit 4]

I've noticed lately that my altitude is way off. I was standing looking at my p3a just over my head and the go app said the altitude was 54 feet. That is way off. Anyone else have this problem? I don't mind 5-10 feet, but this is scary. Anything that I may program preflight could be in trouble. Any ideas?

 

[With The Birds]

Start with an IMU calibration.

 

[MedinaTaylor]

Yeah, that seems to be common.

The Phantom uses the barometer to estimate altitude.

Keep that in mind for long flights

 

[exit 4]

IMU it is, first thing tomorrow.

 

[Phantom751874]

The barometer on these P3's is a bit wonky. They are generally off. Land and power cycle the P3 and see. Might have to do it a few times.

I don't believe an IMU calibration will make any difference at all. I've had flights where it's accurate within a few feet and then flights where it's off by 20-30ft and then back to accurate agiain the next flight. That's just the way the barometer is.

 

[sevy15]

Also don't forget where u take off from is ground zero so any elevation changes of the landscape will give silly altitude readings


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[GadgetGuy]

The barometer on these P3's is a bit wonky. They are generally off. Land and power cycle the P3 and see. Might have to do it a few times.

I don't believe an IMU calibration will make any difference at all. I've had flights where it's accurate within a few feet and then flights where it's off by 20-30ft and then back to accurate agiain the next flight. That's just the way the barometer is.

There is definitely a warmup time for an accurate barometer reading at the launch point. That is the critical reading that calibrates what 0 is, and all other elevation/altitude displays are relative to it. So, let it warm up first under battery power, and then recycle power, and you will get a 'fresh' and more accurate reading at the warmer temp, before you take off.