"maxdraft"=>"3","seamark:name"=>"Mook, keersluis","seamark:source"=>"https://www.vaarweginformatie.nl/frp/main/#/geo/detail/EXCEPT_NAV_STRUCTURE/46192","seamark:gate:category"=>"flood_barrage","seamark:gate:clearance_width"=>"11","seamark:gate:clearance_height"=>"999"