Sluicing signals are shown whenever natural sluicing is being carried out north of the Northern lock or whenever there is being pumped with more than one pump.
The following signs are displayed:
1.

• on the semaphore at the top of the Harbour Operations Centre;
• on the strip of land between the Hoogovens Steel Works and the Outer Sluicing Canal;
• on the eastern point of the island near the Northern Lock;
• at the Velser Tunnel on the northern shore;
• on the western bank of the side Canal C;
• on the western point of the side Canal G (Zaanse Gat).

2.

Beginning one hour before sluicing three horizontal red lights are displayed:

• on the strip of land between the Hoogovens Steel Works and the Outer Sluicing Canal;
• on the eastern point of the island between the sluicing canals and the Northern Lock.

Lights on top Traffic Centre indicate:

	Falling water
	Rising water
	Sluicing

Storm Signal Station
South of the small lighthouse aSS is maintained by a Iightpole. The stormsignals are shown as follows.
Expect windforce:

up to 7 Bft	nr. 0 White over green
more than 8 Bft from SW	nr. 1 White over white
more than 8 Bft from NW	nr. 2 Red over red
more than 8 Bft from SE	nr. 3 White over red
more than 8 Bft. from NE	nr. 4 Red over white

Hydro Meteo Advice Service
The Hydro Meteo Advice Service IJmuiden is accommodated at the Lock Coordination Centre. This bureau provides tidal information for the deep draft vessels bound for lJmuiden/Amsterdam. Also weather forecasts can be obtained at this service address: Traffic Control, tel. 0255-52 39 34, fax 0255-53 51 44.