In sea ice navigation, making headway through an ice pack by boring, breaking, and slewing.


Related Terms

HEADWAY

The forward motion of a boat. Opposite of sternway.

CAST

1. To turn a ship in her own length. 2. To turn a ship to a desired direction without gaining headway or sternway. 3. To take a sounding with the lead.

HEAVE TO

To stop the vessel making headway in bad weather. To back the foresail so the vessel stands nearly still.

HOVE-TO

A condition the vessel is said to be in when it is heading into the wind and sea but making little or no headway

THREE SHEETS TO THE WIND

A ship running free, barely able to keep headway and control. Drunk.

HUMMOCKING

The pressure process by which sea ice is forced into hummocks. When the floes rotate in the process, it is called SCREWING.

HUMMOCKED ICE

Sea ice piled haphazardly one piece over another to form an uneven surface. When weathered, hummocked ice has the appearance of smooth hillocks.

ICE JAM

An accumulation of broken river ice or sea ice caught in a narrow channel

ICE EDGE

The demarcation at any given time between the open sea and sea ice of any kind, whether fast or drifting.

ICE MASSIF

A concentration of sea ice covering an area of hundreds of kilometers, which is found in the same region every summer

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