Setting of COMPASS_USE?

From Paul Riseborough, one of the APM:Plane's developers:

With strong winds our models can fly with the nose pointing 45 degrees or more away from the course heading so a correctly calibrated compass is important to getting good yaw angle (heading) data.

Without correct yaw angle information, the AHRS complementary filter is unable to correctly identify and correct for gyro errors around the roll and pitch axes as some of the pitch error gets assigned to roll and vice-versa.

The upshot is yes, yaw angle really is that important - big yaw errors won't cause a crash like than can for copters, but they can cause APM:Plane to fly badly .

So yes, you need to use the compass and have a good compass heading.

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Graham Dyer September 30, 2013 at 10:43pm

From Paul Riseborough, one of the APM:Plane's developers:

With strong winds our models can fly with the nose pointing 45 degrees or more away from the course heading so a correctly calibrated compass is important to getting good yaw angle (heading) data.

Without correct yaw angle information, the AHRS complementary filter is unable to correctly identify and correct for gyro errors around the roll and pitch axes as some of the pitch error gets assigned to roll and vice-versa.

The upshot is yes, yaw angle really is that important - big yaw errors won't cause a crash like than can for copters, but they can cause APM:Plane to fly badly .

So yes, you need to use the compass and have a good compass heading.
Moderator

Dwgsparky September 30, 2013 at 6:29pm

Hi Guys

I cannot find out from the manual which choice should be the default or indeed which is correct, any ideas.??

thanks

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Setting of COMPASS_USE?

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