This document classifies groups of environmental parameters and their severities to which a product is subjected when installed aboard a ship. Ships where products may be permanently or temporarily installed include: ships propelled by mechanical means, including mobile offshore units; ships not propelled by mechanical means, including sailing boats and life rafts. The classed defined apply to all sizes of ships from pleasure craft to trawlers, ferry boats, icebreakers, cargo ships including tankers. The areas in which ships navigate are: inland waterways (canals, rivers, lakes), coastal eaters, oceans.