ICE_ciSibiDizi
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ICE - Ice group indicator

ci - Concentration or arrangement of sea ice
Code    Description
0          No ice.
1          Ship in open lead more than 1
nm wide or ship in fast ice with boundary beyond limit of visibility.

2 -5 Ice concentration uniform.
2          Open water or very open pack ice,<3/10 concentration.*
3          Open pack ice 4/10 to <6/10 concentration.*
4          Close pack ice 7/10 to <8/10 concentration.*
5          Very close pack ice 9/10 or more, but not 10/10 concentration.*

6 -9 Ice concentration not uniform.
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,poor visibility or because ship is more than 0.5
nm away from ice edge.

(* Ship in ice or within 0.5
nm of ice)

Si - Stage of development
Code    Description
0          New ice only (frazil ice,grease ice,slush,shuga).
1          Nilas or ice rind,<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 (>120 cm thick) and some thinner (younger) first-year ice.
7          All medium and thick first-year ice.
8          Predominantly medium and thick first-year ice with some old ice (usually more than 2 metres thick).
9          Predominantly old ice.
/           Unable to report,because of darkness,poor visibility or only ice of land origin visible or ship is more than 0.5
nm away from ice edge.

bi - Ice of land origin
Code    Description
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,poor visibility or only sea ice is visible.

Di - Bearing of principal ice edge
Code    Description
0          Ship in shore or flaw lead.
1          Ice edge towards NE.
2          Ice edge towards East.
3          Ice edge towards SE.
4          Ice edge towards South.
5          Ice edge towards SW.
6          Ice edge towards West.
7          Ice edge towards NW.
8          Ice edge towards North.
9          Not determined (ship in ice).
/           Unable to report,because of darkness,poor visibility or only ice of land origin visible.

zi - Ice situation and trend over preceding three hours
Code    Description
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.**

6-9 Ice difficult to penetrate,conditions worsening.
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 or poor visibility.

(** Ship in ice)