Data reported in Ships Synoptic Code, Group 2 ICE section (ciSibiDizi).
ci = Concentration or Arrangement of Sea Ice 0 - No sea ice in sight 1 - Ship in open lead more than 1 nautical mile wide, or ship in fast ice with no boundary beyond limit of visibility 2 - Sea ice present in concentrations less than 3/10 (3/8); open water or very open pack ice 3 - 4/10 to 6/10 (3/8 to less than 6/8); open pack ice 4 - 7/10 to 8/10 (6/8 to less than 7/8); close pack ice 5 - 9/10 or more, but not 10/10 (7/8 to less than 8/8); very close pack ice 6 - Strips and patches of pack ice with open water between 7 - Strips and patches of close or very close pack ice with areas of lesser concentration between 8 - Fast ice with open water, very open or open pack ice to seaward of the ice boundary 9 - Fast ice with close or very close pack ice to seaward of the ice boundary / - Unable to report, because of darkness, lack of visibility, or because ship is more than 1/2 nautical mile away from the ice edge Si = Sea Ice Stage of Development 0 - New ice only (frail ice, grease ice, slush ice, shuga) 1 - Nilas or ice rind, less than 10 cm thick 2 - Young ice (grey ice, grey-white ice), 10-30 cm thick 3 - Predominantly new and/or young ice with some first year ice 4 - Predominantly thin first-year ice with some new and/or young ice 5 - All thin first-year ice (30-70 cm thick) 6 - Predominantly medium first-year ice (70-120 cm thick) and thick first-year ice (more than 120 cm thick) with some thinner (younger) first-year ice 7 - All medium and first-year ice 8 - Predominantly medium and thick first-year ice with some old ice (usually more than 2 meters thick) 9 - Predominantly old ice / - Unable to report, because of darkness, lack of visibility, or because only ice of land origin is visible, or because ship is more than 1/2 nautical mile away from ice edge bi = Ice of Land Origin 0 - No ice of land origin 1 - 1-5 icebergs, no growlers or bergy bits 2 - 6-10 icebergs, no growlers or bergy bits 3 - 11-20 icebergs, no growlers or bergy bits 4 - Up to and including 10 growlers and bergy bits - no icebergs 5 - More than 10 growlers and bergy bits - no icebergs 6 - 1-5 icebergs with growlers and bergy bits 7 - 6-10 icebergs with growlers and bergy bits 8 - 11-20 icebergs with growlers and bergy bits 9 - More than 20 icebergs with growlers and bergy bits - a major hazard to navigation / - Unable to report, because of darkness, lack of visibility, or because only sea ice is visible Di = Bearing of Principle Ice Edge 0 - Ship in shore or flaw lead 1 - Principle ice edge towards NE 2 - Principle ice edge towards E 3 - Principle ice edge towards SE 4 - Principle ice edge towards S 5 - Principle ice edge towards SW 6 - Principle ice edge towards W 7 - Principle ice edge towards NW 8 - Principle ice edge towards N 9 - Not determined (ship in ice) / - Unable to report, because of darkness, lack of visibility, or because only ice of land origin is visible zi = Present Sea Ice Situation and Three Hour Trend 0 - Ship in open water with floating ice in sight 1 - Ship in easily penetrable ice; conditions improving 2 - Ship in easily penetrable ice; conditions not changing 3 - Ship in easily penetrable ice; conditions worsening 4 - Ship in ice difficult to penetrate; conditions improving 5 - Ship in ice difficult to penetrate; conditions not changing 6 - Ice forming and floes freezing together 7 - Ice under slight pressure 8 - Ice under moderate or severe pressure 9 - Ship beset / - Unable to report, because of darkness, lack of visibility