Unicore UM981 with built-in IMU

Hi!
I have a question about IMU on this module. Who is responsible for the fusion of IMU readings with GNSS data? Will this be done on the module side or this will be just another sensor for Ardupilot?

Does anyone use this module and have some testing results?

fusion done inside um981

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Thank you for your response! Have you used it successfully previously?

Just ordered sample in process, could posting some data later here

That would be great. Iā€™m using UM980 and wonder if UM981 will bring any improvements. It is also interesting how Ardupilot will behave with zero satellites and position information in the same message.