Is there something with my GPS? (Toiletbowl in Loiter/RTL)

I went out for a test flight today, but I’m having EKF_CHECK errors and my GCRS seems to be ALL over the place in the GPS section.

Still new to reading these logs, so not exactly sure where to look… How can I compare COMPASS heading to the GPS heading?

Link to image below:


Logging set to low to glean anything useful. The check means bad compass health and needs to be checked.


The GCrs is your Ground Course, which means the direction you are travelling. I’ve never really looked at this before, but it would be totally normal to be all over the place if you are just hovering.

There really isn’t much useful data in your logs. Toiletbowling is almost always due to a compass problem.