> For the complete documentation index, see [llms.txt](https://docs.ceruleansonar.com/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ceruleansonar.com/c/rov-locator/inertial-measurement-unit-imu/how-to-tell-which-imu-is-active.md).

# How To Tell Which IMU is Active

Since the IMU type is defined in software it is possible to set either IMU type in the ROVL Receiver or Transceiver. We recommend you use the correct IMU for your model. You can tell which IMU is active by looking on the Dashboard tab of the CeruleanTracker main window. IMU status for a Mk II IMU will be a four-digit number. IMU status for a Cerulean IMU will be "CIMU".

<figure><img src="/files/ZZiPYtJoBhdFkjzkUBkb" alt=""><figcaption><p>Mk II IMU (left side, circled in red), Cerulean IMU (right side, circled in red)</p></figcaption></figure>