| Term: | Open pack ice |
| Definition: | Composed of floes seldom in contact and with many leads; ice cover 4/10ths to 6/10ths. |
| Term: | Open pack ice |
| Definition: | Floating ice in which the ice concentration is 4/10 to 6/10, with many fractures, and floes that are generally not in contact with one another. |
| Term: | Open pack ice |
| Definition: | Pack ice in which the ice concentration is four-tenths to six-tenths, with many leads and polynyas, and the floes are generally not in contact with one another. |
| Term: | Open pack ice |
| Definition: | Composed of floes seldom in contact and with many leads. Ice cover 4/10ths to 6/10ths. |