PRECAUTIONARY AREAS Vessels entering the IJMUIDEN precautionary areas should navigate with extreme caution as vessels on route to and from TSS off Texel, IJmuiden, the Westerschelde and Europoort may be merging or crossing. 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. 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. VESSEL REPORTING For details of the IJmuiden Vessel Traffic Service, see the Netherlands Coast Pilot (HP1) or ADMIRALTY List of Radio Signals. 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. 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. Unauthorized 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) or the Mariner's Handbook. FIRING PRACTICE AREA For information concerning Firing Practice Areas, see the Netherlands Coast Pilot (HP1) and ADMIRALTY Sailing Directions.