Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

I have yet to calibrate my compass

Discussion in 'Phantom 2 Vision Discussion' started by gfredrone, Feb 13, 2014.

  1. gfredrone

    Joined:
    Jan 24, 2014
    Messages:
    1,221
    Likes Received:
    191
    Anyone know why mine just worked right out of the box without calibration? I've always had accurate telemetry and green flashing lights after the 6 sats are locked. What is the purpose of calibrating if everything is green and north is north?
     
  2. dkatz42

    Joined:
    Jan 16, 2014
    Messages:
    165
    Likes Received:
    1
    Location:
    New Mexico, USA
    North isn't north. (Google "magnetic declination".)
     
  3. gfredrone

    Joined:
    Jan 24, 2014
    Messages:
    1,221
    Likes Received:
    191
    "The magnetic declination in a given area may (most likely will) change slowly over time, possibly as little as 2–2.5 degrees every hundred years or so"

    I won't live that long but I guess I should go ahead and calibrate for my area and when I take the P2V to other areas.

    What I meant is north on the telemetry is pointing north as it should. It flys great and comes home and lands where it lifted off on command. Not sure why everybody is doing the calibration dance so much.

    If you wait until you have 6 blue sats the green lights will start flashing and it's go time. No need to calibrate every flight unless the light indicators are telling you to do so.
     
  4. gunslinger

    gunslinger Moderator
    Staff Member

    Joined:
    Nov 3, 2013
    Messages:
    2,722
    Likes Received:
    497
    Location:
    Least Coast...
    I agree, to an extent. I had a situation where all lights said "go" but I let her hover around 10 feet up and she was sliding all over the place. I took her down, did the compass cha cha and she was right back in sync. Before the dance it looked like she was in the midst of a low altitude death spiral.

    I don't do the dance unless she misbehaves during her low altitude test routine.

    -slinger
     
    dirkclod likes this.
  5. dkatz42

    Joined:
    Jan 16, 2014
    Messages:
    165
    Likes Received:
    1
    Location:
    New Mexico, USA
    Yep. And presumably when it came out of the box the compass was calibrated to *some* declination; perhaps you were lucky enough so that that happened to be close to yours.

    It can change by a degree over 100 miles or less, depending on where you are.
     
  6. gfredrone

    Joined:
    Jan 24, 2014
    Messages:
    1,221
    Likes Received:
    191
    Good info, I noticed some sliding just after lift off today but then it quit. I usually let it hover about 20 feet up for 30 seconds or so before ripping up the sky. I'll calibrate before my next flight.
     
  7. gunslinger

    gunslinger Moderator
    Staff Member

    Joined:
    Nov 3, 2013
    Messages:
    2,722
    Likes Received:
    497
    Location:
    Least Coast...

    Yup... 6 feet, 10 feet, 20 feet, it's all pretty much the same. It's just a really good idea to do a "post liftoff" - "pre-flight" check before slamming the left stick full up... I found this out the hard way (though I got SO lucky that it ended well)

    Strolling around this forum is the best thing you can possibly do to insure your $1,200 investment. There are some very experienced, very reliable people involved in this place. In other words... You came to the right place, bro.. :D :D
     
    dirkclod likes this.
  8. iDrone

    Joined:
    Nov 14, 2013
    Messages:
    612
    Likes Received:
    2
    Location:
    Los Angeles, California USA
    +1 :!:
    iDrone
     
  9. XJoeyX

    Joined:
    Jan 9, 2016
    Messages:
    60
    Likes Received:
    24
    Perhaps I'm just overly cautious, but I calibrate my compass EVERY TIME before my first flight. What's 30 seconds of battery time, if it'll save a $1000 investment? (And YES, I realize it is no longer $1000 investment. Just trying to stress my point.)
    Just my $0.02 worth...
     
  10. Mark The Droner

    Joined:
    Aug 26, 2015
    Messages:
    3,933
    Likes Received:
    1,149
    Location:
    Brookeville, MD, USA
    Some say it's not wise to calibrate your compass when you already have a compass that you know has a good calibration because you risk getting a bad calibration when you re-calibrate.
     
    dirkclod likes this.
  11. XJoeyX

    Joined:
    Jan 9, 2016
    Messages:
    60
    Likes Received:
    24
    Perhaps, but by following this logic, you would NEVER calibrate your compass (unless changing locations). Perhaps it's merely a personal preference. I know I like calibrating before my first take-off. I transport my drone back and forth to the park, and the bumps and jostling it gets while on the way MIGHT have some effect.

    To each his own... It's only money, right?? Hehehehe
     
  12. Mark The Droner

    Joined:
    Aug 26, 2015
    Messages:
    3,933
    Likes Received:
    1,149
    Location:
    Brookeville, MD, USA
    I think it's a multi-step process:

    1) Decide to fly.

    2) Decide whether to calibrate or not.

    3) Launch and hover. If the craft doesn't hover correctly, land and calibrate.

    Yes - to each his own. Absolutely. ;)
     
  13. XJoeyX

    Joined:
    Jan 9, 2016
    Messages:
    60
    Likes Received:
    24
    I think that is a very reasonable approach. I always do that first little take-off hover. even AFTER calibrating, i always take a look to see if everything appears to be working correctly, and THEN I fly...

    The funny thing is, i almost always fly in the same place, so perhaps I don't even need to calibrate ONCE, but I figure I'd rather err on the side of caution. :)