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Compass Calibration

Discussion in 'General Discussion' started by Bhloscaidh, Aug 15, 2017.

  1. Bhloscaidh

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    I am a new P3 Standard pilot (two months) and find this forum to be extremely helpful in terms of providing help and information. In following several recent threads, I have repeatedly viewed the suggestion "not to calibrate your compass every flight". I am confused: If I change launch locations how will the P3 RTH from my current launch site and not a previous launch location? Thanks to all of you who help newbies more than you know.
     
  2. microlinux

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    You're confusing the compass with GPS. A compass indicates direction, GPS indicates position. To reach a position, you need an accurate compass. Unless you move between areas with great magnetic differences, your compass should generally remain accurate without re-calibrating.
     
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  3. msinger

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    macoman likes this.
  4. Meta4

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    GPS and compass are two separate systems.
    Your Phantom uses GPS to record it's home point for RTH and it does that all by itself without you doing anything.
     
  5. Bhloscaidh

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    Thank you all for your helpful links and information. Two follow-up questions:
    1) Is the following statement accurate: "The aircraft GPS only finds locations such as my RTH location at launch and the compass helps the aircraft navigate to that GPS location"?
    2) The last few times I have launched my aircraft, before receiving this helpful hints, I calibrated my compass since I launched from several different locations. After calibration, or maybe it occurred during calibration, I received a notice on my DJI GO app that asked me to turn off my GPS since it had identified magnetic/electronic fields or sources nearby. I was launching from a rural park in which there were no cell towers, buildings, telephone/electric power lines, etc nearby. The only magnetic or electronic sources nearby that I could identify were my iPhone attached to my controller and the gold crucifix I was wearing around my neck. In response to this nag notice, I held the aircraft at arm's length away from my body while calibrating and the warning message disappeared and the GPS icon on the DJI Go app indicated I was ready for flight. In light of the horror stories I have read on this forum concerning crashes, fly-a-ways, and loss of control what was the significance of the process described above and what could have been causing the warning message? Thanks again to all of you who have provided suggestions.
     
  6. Meta4

    Meta4 Moderator
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    1. GPS does a lot more, it's keeping track of where your Phantom is at all times and providing position holding ability.
    The compass is necessary for the Phantom to be able to fly straight
    2. You don't need to recalibrate your compass because you move locations.
    When you have a good clean compass calibration, just leave it alone.
     
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