Beginning and ending of JF-bouys in OSM fit with your sailingmap, but in between there seem to be some clutter. 
About the registration: see for instance  http://map.openseamap.org/?zoom=15&lat=52.92649&lon=5.51539&layers=BFTFFFFFFTF0FFFFFFFFFF
And here you can see: the JF 60 in OSM - as well in official ANWB-map - is marked in reality as JF 62. 