Create marker with fixed position on a arialmap

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Hey :) I want to build a heatmap over a ArailMapDisplay with an MarkerArray. I fail to attach the markers to the map. If the roboter moves and the map is updated, the map moves under the MarkerArray. I want to attack the MarkerArray to the map such that the MarkerArray is shifted together with the map when updated. Is that possible or do i have to shift the origin of the array by hand if my roboter moves? Thanks in advance