Sea Ice Description

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

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