SOUNDINGS IN METRES
Reduced to Volkerak datum (=NAP)

HEIGHTS IN METRES
Above Volkerak datum

(The waterlevel can vary between NAP-1dm ans NAP+1,5 dm)

The beacons mark at least the 1,5 metre depth contour (ħApril-October).
More beacons can be met than charted.

Outside the connecting lines between the lighted fairway beacons 
regels (fishing stakes and traps) can be met 50 to 100 metres apart.