I don’t think that Iris does has a barometer or other altitude-sensing device, apart from the GPS unit. I know that GPS can approximate altitude, but not very accurately. So how is Iris able to land so nicely in Land or RTL flight modes?
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Good question Nick, I have the same issue, it allways gives me like 5 meters higher then it should be, Would like to be able to calibrate it.
Lets wait together for someone to answer, you've been waiting for a long time haha :)