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Sensor Bias Too Large...

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I always try to find the most level area I can but it never fails. EVERY SINGLE time I calibrate the IMU and compass and go to take off I get the "Sensor Bias...place on a flat level surface" warning. Wondering if anyone else has to contend with this issue as much as me. Suggestions?
 
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I always try to find the most level area I can but it never fails. EVERY SINGLE time I calibrate the IMU and compass and go to take off I get the "Sensor Bias...place on a flat level surface" warning. Wondering if anyone else has to contend with this issue as much as me. Suggestions?
Mine did that once. I can't see very well and I thought it said "senior" bias so I tried to ignored it

Edit: didn't want to sound flippant, really did happen, so I got my level, placed Inspire on table, used paper under legs until perfectly level, then recalibrated, problem hasn't re-occurred, and the horizon seems more level
Edit:
Ya, and what Damon says below, once you get imu right leave it alone until next firmware upgrade or it starts flying crazy

Enjoy life and be nice
 
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You don't need to do the IMU calibration before every flight as a practice unless the mod values for the sensors are high or the app tells you to.

Just the compass if you change locations.
 

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You don't need to do the IMU calibration before every flight as a practice unless the mod values for the sensors are high or the app tells you to.

Just the compass if you change locations.
+1

Last time I did an IMU calibration was when I updated to .17
However, I ALWAYS check my mod values before EVERY flight, if there were ever outside of the stipulated parameters or I got an error message I would calibrate again.
 
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