text: Hi pyrog!
  
  The solution to your tagging issue might be this picture:
  
  https://www.mapillary.com/app/?lat=53.02524722222222&lng=8.881944444444445&z=17&pKey=suhXc4F7UTShrmrbkLr2_w&focus=photo
  
  Looks like a reflector to me. Can you take over tagging and closing of the four OSM-notes? I am not proficient with seamark tagging. Thank you!