Move marker array according to lat/long values

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Hi everyone,

I have a marker array displayed in RViz.
I also have a sensor_msgs/Imu, and sensor_msgs/NavSatFix and gps_common/GPSFix messages being published. The data was recorded while driving on a motorway and unfortunately I'm not able to add any further sensors.

Can someone give me any pointers on how to move the marker in RViz according to the "real world" coordinates (latitude and longitude)? I'm happy to provide any further information!
Thank you so much!!