Simplified ice chart and reference charts

Normal situation Previous ice map Ice map of the previous year Icebreakers

Ice map of the previous year


The ice is drifting slowly eastward.

In the northern Bay of Bothnia 45-80 cm thick fast ice in the archipelago approximately to Kemi 3 and Oulu 3. To Oulun portti 25-80 cm thick ridged consolidated ice. Farther out, approximately to the line Simpgrund - Nahkiainen, there is open water. Farther south 10-50 cm thick ridged close and very close ice.

In the southern Bay of Bothnia 20-45 cm thick rotting fast ice in the archipelago. Farther out 10-50 cm thick ridged close and very close ice and. From 20 nautical miles west of Kallan towards Quark open water.

In the Quark, in the Vaasa archipelago, rotten fast ice to west of Storhästen. There are openings in the ice field. Farther out open water.

In the Sea of Bothnia northern part rotten ice in places in the inner archipelago.

In the Archipelago Sea and in Western Gulf of Finland ice free.

In the Eastern Gulf of Finland rotten ice in Gulf of Vyborg.

Icebreakers: Polaris, Otso and Kontio assist in the Bay of Bothnia.

Assistance restrictions: Minimum ice class and deadweight required of assisted vessels:
Tornio, Kemi, Oulu, Raahe, Kalajoki, Kokkola and Pietarsaari, IA of more than 2000 tons.
Vaasa, II of more than 2000 tons.

Vessels bound for Gulf of Bothnia ports in which assistance restrictions apply shall, when passing the latitude 60N, report their nationality, name, port of destination, ETA and speed to ICE INFO on VHF channel 78. This report can also be given directly by phone +46 10 492 7600.

Vessels bound for ports in the Bay of Bothnia shall report to Bothnia VTS 20 nautical miles before Nordvalen lighthouse on VHF channel 67.

The traffic separation scheme in the Quark is temporarily out of use.

About the charts

The ice chart of the whole Baltic Sea (pdf) is published in the autumn twice a week (Monday and Thursday) and daily when the amount of ice increases until until ice break-up in spring. It represents current ice situation, ice breaker positions and traffic restrictions in the Baltic Sea.

The simplified charts are updated once a week at the latest on Tuesday morning. The first one represents measured level ice thicknesses, ice coverage and sea surface temperature. The reference charts represent average, 1965 – 1986, ice situation on that day (= normaali), last week´s situation, last year´s situation and the positions of the ice breakers.

Explanation of chart's finnish words

  • jäätä: ice
  • vettä: water
  • haurasta: rotten ice


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