OK. So Hubsan now have labeled Heading YAWMrDronenut wrote: ↑Fri Dec 14, 2018 9:34 pmPete. This is for you and DonHienz both.
If you will d/l the "Compass"app from "Play Store",it will help you to see if your compass is compromised.
1.Open the compass app and set it down on a table,and get it turned until it reads "0°"
2.Turn on Remote,Zino,and device. Let it all link up.
3. In lower right corner,see where it says "yaw". It will read in degrees.
4. Turn Zino,sitting flat on the table,until the "yaw" reading is 0°.
See how much difference between the reading or in the direction your Zino is compared to what your compass app is reading.
With Zino flat on the table,and your phone flat on the table,,Zino's camera,and The top of your phone should be pointingin the same direction. Both should be within 2-3°of each other.
If not,recalibrate Zino.

My humblest apologies for not noticing.
I have no need to download any compass app

Using a compass app on your phone actually tells you very little.
It can be out of calibration just the same as the quad can be.
Taking a horizontal reading is also non conclusive.
The magnetometer measures the magnetic field in 3 axis, x,y and z.
Just comparing the horizontal reading tells you only that it's roughly the same when the quad is perfectly level.
Unfortunately quads pitch and roll to initiate movement (and stay in position), which is why, during calibration, you have to turn the quad in the x plane then the y and it integrates the two to give you a "spherical" calibration offset table.
You' can tell more about calibration performance just by lifting the rear legs and pitching the quad forward, than you ever will by comparing two different electronic compasses, calibrated differently.
You're better off using a real compass, and keeping it well away from the quad
