Types of icing at sea

There are two main types of icing at sea: icing from seawater and icing from fresh-water. Icing from seawater may be due either to spray and seawater thrown up by the interaction between the ship, or installation, and the waves or else to spray blown from the crests of the waves or both. Icing from fresh-water may be due to freezing rain and/or drizzle, or occasionally wet snow followed by a drop in temperature, or it may be due to freezing fog. Both types may occur simultaneously.