SOUNDINGS IN METRES
Reduced to Grevelingen datum (=NAP-2dm)
The datum can vary between
NAP-1dm and NAP-3dm

HEIGHTS IN METRES
Above Grevelingen datum

SUPPLEMENTARY MARKS
In these waters supplementary marks for pleasure craft 
and special marks for areas meant for waterskiing, kite surfing, 
jet-skiing and fast motorboats and areas under the Nature Conservation 
Act are on station from ± April-October.

The beacons mark at least the 
1,5 metre depth contour (±April-October).

Outside the buoyage of the fairway called "Grevelingen"
all kinds of fishing gear may be encountered

In this area Marine farms may occur. These devices are marked 
with yellow buoys with entry prohibited signs.

SWIMMING AREA
Sailboards prohibited

SPEED RESTRICTIONS
In these waters restrictions for sailing with fast
motorboats and waterskiing are in force.

CABLES AND PIPELINES
It is prohibited to anchor and trawl in the vicinity of 
submarine cables and pipelines. Pipelines are not always buried 
and their presence may significantly reduce the charted depth. 
They may also span seabed undulations and cause fishing gear to 
become irrecoverably snagged, putting a vessel in severe danger.

WINTER-BUOYAGE 
From ± December-March buoyage may be replaced by winter-buoyage. 
In severe winters buoyage is withdrawn. Buoyage will be replaced 
in order of importance. In spring it is possible that not all 
channels are already buoyed as charted.