Need help picking right imu

Hi. I want to get the orientation (not Position) of a board marker through imu and arduino over nrf24l01. I need small sized and pretty accurate IMU

The easiest IMU to use is the BNO055, but under [u]good[/u] conditions, yaw values are typically +/- 3 degrees (1 sigma).

Explain what you mean by "pretty accurate".