OIL AND GAS FIELDS
Production platforms and associated structures, including tanker moorings,
storage tankers and platforms on pipelines, generally exhibit MO (U) lights,
aircraft obstruction lights and audible fog signals. 
Unauthorised navigation is prohibited within 500 metres of all such structures, including storage
tankers which can swing about their moorings. Tankers manoeuvring in the
vicinity of platforms and moorings should be given a wide berth.
For further information see The Netherlands Coast Pilot (HP1).

SUBMARINE CABLES AND PIPELINES
Mariners are advised not to anchor or 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.

VESSEL REPORTING
For details of the Den Helder and IJmuiden Vessel Traffic Service see
Admiralty List of Radio Signals and the Netherlands Coast Pilot (HP1).

TRAFFIC SEPARATION SCHEMES AND ROUTEING
For the latest information on individual schemes and IMO mandatory routes 
for certain tankers and other vessels, see the Netherlands Coast Pilot (HP1) 
or Admiralty Sailing Directions.

FIRING PRACTICE AREA
For information concerning Firing Practice Areas, see The Netherlands Coast Pilot (HP1)
and Admiralty Sailing Directions.

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. For the latest information see Notices 
to Mariners or consult the pilotage authorities.