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

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

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In severe winters buoyage is withdrawn.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.