This option will incorporate the entire coastline (as defined by an ocean polygon) as a single, continuous outlet. An ocean polygon vector layer must first have been added to the CatchmentSIM project in order for this to work. The coastline outlet can subsequently be subdivided using the Subcatchments >> Edit Outlet >> Edit Subcatchment Outlet Pixels. For example, this can be useful for subdividing the coastline into different outlets representing coastal and riverine catchments.