IMU Message

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I was getting my Phantom ready for take-off today and saw a message something like "IMU Warming up". It was in the 80's here today and I have never seen that message. Is this normal on the Phantom 3?
 
Da old cold IMU cal. You wouldn’t beleave the crap I get recommending that in Mavic forum. ?I do it with my Mavics.
 
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The IMU has some precision accelerometer sensors in it. These need to be at a stable temperature to work accurately. Applying power to them for a few minutes before flight allows their internal temperature to stabilize and achieve full accuracy.
 
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