Wrong compass orientation when I stop

erichourant

My Edge 1050 is positioned "track up". When I ride, the compass works perfectly. It follows the direction of my bike.

But as soon as I stop, the compass turns to the NNW. When stationary, the compass does not follow the orientation of my handlebars.

When I start, the compass finds the correct direction.

The problem is with the basemap changing orientation as soon as I stop and repositioning itself correctly when I move.

It's really annoying when I have to stop to check a path or direction.

I noticed that this comes from the Cycliq FLY6 camera that is installed below (+/- 10 cm) of my Edge 1050.

I can understand that there could be interference between the camera and the Edge but I can't understand why the problem only shows up when stationary and everything goes well when I move.

When I remove the Fly6, everything is fine.

Software Version : 30.11

  • 0

    So when stationary the Edge switches from using GPS data to determine direction to using the built in magnetic compass as needs movement to use GPS data to compute the heading.

    I had the same issue with my Fly6 and ended up switching to the Garmin Varia Vue that did not have this problem. The Fly6 should really be shielded to prevent interference, but it does not appear to be.

  • 0 in reply to aweatherall

    Thank you for your answer, which seems quite logical to me. I guess when stationary, the Edge uses its internal compass to save power.

  • 0 in reply to erichourant

    It uses the magnetic compass when stationary as you cannot compute the heading using GPS position data unless you are moving as the data is just single static location when stopped.

  • 0 in reply to erichourant

    The devices determine heading by using the difference between two GPS points (the current point and the prior point). The heading is more accurate the faster you are going (which means the points are farther apart).

    If you are not moving, the small error in GPS positioning means the heading moves around randomly.

    To avoid garbage heading values when not moving, the devices use the compass (measuring magnetic north). The compass heading is less accurate than heading from GPS (when moving) in part because various things can interfere (including magnetic declination and nearby electronic devices) with the compass.