VESSEL TRAFFIC SERVICE (VTS)
For procedures and working details of the Den Helder Vessel Traffic Service, 
see Netherlands Coast Pilot HP 1 or Admiralty List of Radio Signals.

CABLES AND PIPELINES
Mariners are advised not to anchor or trawl in the vicinity of
cables and pipelines. Pipelines are not always buried and their presence may
effectively reduce the charted depth by up to 2 metres. They may
also span seabed undulations and cause fishing gear to become
irrecoverably snagged, putting a vessel in severe danger. See the
Netherlands Coast Pilot (HP 1).

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.

CENTRAL REPORTING POINT WADDENZEE
For all reports and information.
Telephone:  +31 (0)88 79 74 599
VHF 4 (Safety and distress calls:VHF 16)

MARINE FARMS
Marine farms excist within the areas indicated. They may not al be shown individually 
and their positions may change frequently. Marine farms may be marked by lit or unlit 
buoys or beacons. Mariners are advised to avoid these structures and their associated moorings.

DEPTHS AND AIDS TO NAVIGATION
The channels and depths shown on this chart are subject to frequent change.
The buoyage and other aids to navigation are adjusted accordingly.

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is withdrawn.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.

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