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It is possible to get IMU Data even when not initialized. If you take a closer look on the source code, it gets pretty obvious, that only:

if (packet->nav_status == 4)

any data get published. If you change that to:

if(packet->nav_status == 1)

you can receive even data, if GNSS is not initialized. I don't know if there is a use-case for it and I do not recommend it. But maybe if you only want to check if data are received if the status is "IMU ONLY" then this might help.

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