Before revision: Inuit travellers could orientate themselves, and give directions to others, to describing sea-ice conditions that were known to recur at the same locations each year: such as, ice ridges and pressure ridges, an ice build-up, polynyas, areas of open water surrounded by sea ice, caused by the prevailing wind or marine currents, and ice cracks or leads opening in the drift ice zone.
After revision: Inuit travellers could orientate themselves, and give directions to others, to describing sea-ice conditions that were known to recur at the same locations each year: such as, ice dunes and pressure ridges, an ice build-up, polynyas, areas of open water surrounded by sea ice, caused by the prevailing wind or marine currents, and ice cracks or leads opening in the drift ice zone.