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Altitude accuracy

Discussion in 'Phantom 2 Vision Discussion' started by mtsoule, Jul 29, 2014.

  1. mtsoule

    Jul 17, 2014
    Likes Received:
    let me preface everything by saying that I am a newbee and have only flowen my P2V less than a week and about 7 times.

    I have noticed that my altitude as reported by my iPhone 4 DJI app, says I am always higher than what I believe. for example, today, I was actuall at about 60ft and it reported about 100 ft. is this normal?

    I believe that the P2V uses barometric pressure to determine altitude (read that somewhere, don't know for a fact), if that's the case I am sure it is not very accurate. what is a normal tolerance +/- 20ft?

    also, I think the reported altitude is from home position, not sea level, is that correct?

    thanks for the experience!
  2. Pull_Up

    Nov 5, 2013
    Likes Received:
    South Oxfordshire, UK
    The barometric sensor is inside the Naza flight controller, which sits on the middle of the main circuit board under the shell... right on top of a nice warm lipo battery! Air density decreases with temperature as well as altitude so that's probably got a lot to do with it, as well as ambient temperatures being higher in the summer anyway. And you're right, it simply takes the pressure at the moment of power up *** being effectively "zero" - so it's a measure of height, not altitude.
  3. ProfessorStein

    Jun 20, 2014
    Likes Received:
    Portland, OR
    Never thought about that. Whoops!
    Thanks Pull_Up.
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