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A couple things:

Your IMU data has a frame_id of imu_link, and your GPS has a frame_id of GPS_link. You need to define static transforms from imu_link -> base_link and from gps_link to base_link.
Keep in mind that, once navsat_transform_node gets a single usable IMU message, it unsubscribes from the IMU data. It only needs a single earth-referenced heading measurement.

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