Name	Notation	Description	Types	Status
Ship in open water with floating ice in sight	0		Concept	stable
Ship in easily penetrable ice; conditions improving	1		Concept	stable
Ship in easily penetrable ice; conditions not changing	2		Concept	stable
Ship in easily penetrable ice; conditions worsening	3		Concept	stable
Ship in ice difficult to penetrate; conditions improving	4		Concept	stable
Ship in ice difficult to penetrate; conditions not changing	5		Concept	stable
Ship in ice difficult to penetrate and conditions worsening. Ice forming and floes freezing together	6		Concept	stable
Ship in ice difficult to penetrate and conditions worsening. Ice under slight pressure	7		Concept	stable
Ship in ice difficult to penetrate and conditions worsening. Ice under moderate or severe pressure	8		Concept	stable
Ship in ice difficult to penetrate and conditions worsening. Ship beset	9		Concept	stable
Unable to report, because of darkness or lack of visibility	30		Concept	stable
Missing value	31		Concept	stable