0 0 NEW ICE ONLY (FRAZIL ICE, GREASE ICE, SLUSH, SHUGA)
1 1 NILAS OR ICE RIND, LESS THAN 10 CM THICK
2 2 YOUNG ICE(GREY ICE, GREY-WHITE ICE
3 3 PREDOMINANTLY NEW AND/OR YOUNG ICE WITH SOME FIRST-YEAR ICE
4 4 PREDOMINANTLY THIN FIRST-YEAR ICE WITH SOME NEW AND/OR YOUNG  ICE
5 5 ALL THIN FIRST-YEAR ICE (30-70 CM THICK)
6 6 PREDOMINANTLY MEDIUM FIRST-YEAR ICE (70-120 CM THICK) AND THICK FIRST-YEAR ICE (>120 CM
7 7 ALL MEDIUM AND THICK FIRST-YEAR ICE
8 8 PREDOMINANTLY MEDIUM AND THICK FIRST-YEAR ICE WITH SOME OLD ICE (USUALLY MORE THAN 2 METRES THICK)
9 9 PREDOMINANTLY OLD ICE
30 30 UNABLE TO REPORT, BECAUSE OF DARKNESS, LACK OF VISIBILITY OR BECAUSE ONLY ICE OF LAND ORIGIN IS VISIBLE OR BECAUSE SHIP I S MORE THAN 0.5 NAUT
31 31 MISSING VALUE
