The IMU is the drone’s inner ear — it senses linear acceleration and angular velocity, and (when fused) provides orientation. The flight controller’s EKF3 consumes the IMU stream at ~400 Hz to maintain attitude; without a healthy IMU, nothing else works.
Our pick is the BNO085 — a 9-DoF IMU with built-in sensor fusion that emits a stable quaternion directly. The ArduPilot built-in fusion (EKF3) can also work with raw IMU, so the BNO085 is a backup option more than a primary integration.
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