Adding OpenSeaMap to QGIS QuickMapServices

Question

I'd like to add OpenSeaMap to QuickMapServices. Their wiki http://wiki.openseamap.org/index.php?title=De:OpenSeaMap_in_Website has some usage examples and lists the following tile servers:

http://t1.openseamap.org/seamark/ 
http://tiles.openseamap.org/seamark/ 

But all attempts to configure these servers in QuickMapServices have resulted in layers that look like scrambled noise / confetti.

Answer 1

URL should be:

http://tiles.openseamap.org/seamark/{z}/{x}/{y}.png    
http://t1.openseamap.org/seamark/{z}/{x}/{y}.png

Result: