fansfd87260c
lvl.1
United States
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I'll say one thing about this thread, confusing as all get out and left me scratching my head. I thought I would apply a bit of common sense by first defining what the IMU is;
Inertial Measurement Unit (IMU) and Attitude Heading Reference System (AHRS). Incorporating the latest MEMS sensor technology, the VN-100 combines 3-axis accelerometers, 3-axis gyros, 3-axis magnetometers, a barometric pressure sensor and a 32-bit processor. Along with providing calibrated sensor measurements, the VN-100 also computes and outputs a real-time 3D orientation solution that is continuous over the complete 360 degrees of motion.
Source; http://www.vectornav.com/products/vn-100
This may not be the part that is in the Mavic but we get the idea of what the IUM does.
DJI tells us the IMU was calibrated at the factory and unless notified by the app, re-calibration is not required.
As long as the position of the IMU chip remains the same with respect to the airframe, I can see absolutely no reason to recalibrate the IMU.
Regarding the advice from DJI's support to recalibrate before each flight or any of the ambiguously worded advice about re-calibrating the IMU, now that we have a better understanding what the IMU contributes to the aircraft, we can make a logical decision. Simply leave it alone unless the apps tell us otherwise. First line support people do not have the exposure and likely do not have the knowledge base to form a conclusion about the IMU's aircraft integration. If I spoke with a DJI engineer that actually had involvement in the software and hardware design of the IMU circuit, that would be different.
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