This forum uses cookies
This forum makes use of cookies to store your login information if you are registered, and your last visit if you are not. Cookies are small text documents stored on your computer; the cookies set by this forum can only be used on this website and pose no security risk. Cookies on this forum also track the specific topics you have read and when you last read them. Please confirm whether you accept or reject these cookies being set.

A cookie will be stored in your browser regardless of choice to prevent you being asked this question again. You will be able to change your cookie settings at any time using the link in the footer.

  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
heading adjustment ... when does it stop?
#11
What type of adjustments? How much is the error each time? Does locking the calibration help?

Does your moitessier hat have the metal shield over the radio? It is magnetic, test with magnet, and far too close to the compass sensors. I may have a very early moitessier hat.

Pypilot continuously computes the compass to GPS offset for GPS mode. It steers compass course plus this offset since GPS is too slow to use directly. This offset accounts for leeway, currents, and compass errors all together.
  Reply
#12
(08-13-2019, 11:30 AM)seandepagnier Wrote: What type of adjustments?   How much is the error each time?  Does locking the calibration help?

Does your moitessier hat have the metal shield over the radio?  It is magnetic, test with magnet, and far too close to the compass sensors. I may have a very early moitessier hat.

Pypilot continuously computes the compass to GPS offset for GPS mode.  It steers compass course plus this offset since GPS is too slow to use directly.  This offset accounts for leeway, currents, and compass errors all together.

Hi Sean

So here is a screen shot of an example https://drive.google.com/file/d/1it0v_Uk...EAPc4/view
This happens on compass mode or gps mode but definitely happens anytime I switch between the two, it also happens when I change heading say like 180 degs.

Strangely enough the adjustment is usually about -30 degs or +30 or close to zero something like 3 or -3 but from -30 to +3 or vis-versa depending on the day, 
I have to lock calibration if I do not I am unable to maintain a heading
  Reply
#13
If you must lock calibration then do so, but I would carefully look at the calibration plot while it's unlocked to understand what is going on.

It's most likely there is magnetic interference of some kind.
  Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)