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Mini iosd vs Flytrex data

Discussion in 'Phantom 2 Discussion' started by tgreenstone, Nov 11, 2014.

  1. tgreenstone

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    Good morning, I have done some digging around and I'm curious about these two numbers being so far apart. I have the DJI mini iOSD installed with my full FPV system. I made a little cheat sheet with converting meters to feet so I can understand where I am in the air. Today I did a test run at home and I did not cross 100 m in the air when referencing my screen data.(which should roughly be 330 ft) Upon uploading my Flytrex data, it says my peak height was 744 feet. I am not sure why these are so different. I understand the flytrex has a barometer and today was a bit overcast and storm imminent, Could this be the reason for the difference? It is the new FlightTrack Core 2 model.

    Thanks!
     

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  2. ianwood

    ianwood Taco Wrangler
    Staff Member

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    OSD shows relative height. So if you take off from the top of a 100ft building and it shows 200ft on the OSD, you're 300ft above the ground.

    Flytrex, I have no idea what it tells you. It could be showing you height above sea level (height of the ground + height above the ground) but without a calibrated input for sea level pressure on the day, your measurement could be far off.
     
  3. Fdnyfish

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    Max ascent is your ground based altitude. Max alt is sea level
     
  4. tgreenstone

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    Ok, That makes it all really click. Thanks guys!