Name	Notation	Description	Types	Status
New ice only (frazil ice, grease ice, slush, shuga)	0		Concept	stable
Nilas or ice rind, less than 10 cm thick	1		Concept	stable
Young ice (grey ice, grey-white ice), 10-30 cm thick	2		Concept	stable
Predominantly new and/or young ice with some first-year ice	3		Concept	stable
Predominantly thin first-year ice with some new and/or young ice	4		Concept	stable
All thin first-year ice (30-70 cm thick)	5		Concept	stable
Predominantly medium first-year ice (70-120 cm thick) and thick first-year ice (>120 cm thick) with some thinner (younger) first-year ice	6		Concept	stable
All medium and thick first-year ice	7		Concept	stable
Predominantly medium and thick first-year ice with some old ice (usually more than 2 metres thick)	8		Concept	stable
Predominantly old ice	9		Concept	stable
Unable to report, because of darkness, lack of visibility or because only ice of land origin is visible or because ship is more than 0.5 nautical mile away from ice edge	30		Concept	stable
Missing value	31		Concept	stable