When asked about north Atlantic icebergs and the prospect of striking one, our captain tells us he's staying 10 miles outside the current ice limit defined by the International Ice Patrol.
The International Ice Patrol was created in the Titanic aftermath. I like their maps. Look in the map legend. A 'Growler' is a piece of sea ice smaller than a 'Bergy Bit' which is smaller than an Iceberg.
Yours in the language of the Arctic subculture,