SOUNDING IN METRES
Reduced to Approximate LAT (=NAP+1dm)

HEIGHTS IN METRES
Mean Sea Level
Vertical clearances above HAT.

CHANGING FAIRWAYS
Due to strong currents the fairways are changing continuously.
Actual depth may differ from the charted soundings. The buoyage
is adjusted accordingly.

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.

TIDAL STREAMS
Attention is drawn to the strong tidal streams in these waters.
For tidal streams and tidal information see: HP 33 Tidal heights
and streams for coastal waters of the Netherlands and adjacent waters
and HP 33D-NLTides published by the Netherlands Hydrographer.