0 0 No sea-ice
1 1 Slush or pancake ice
2 2 Level ice (ice having a flat and level surface)
3 3 Rafted ice (a type of pressure ice formed by one cake overriding another)
4 4 Pressure ridge/ridged ice (pressure ice in the form of a ridge or many ridges)
5 5 Hummocks
6 6 Pressure ice
7 7 Rotten, disintegrating ice
8 8 Not used
9 9 Not determined or unknown
15 15 Missing value
