A soft blue buoy, guiding sailors through misty channels.
Sea Mark is a pastel blue.
It can be described as pastel, soft, light and unsaturated.
Set in black, because black reads best on it.
A sea mark, also seamark and navigation mark, is a form of aid to navigation and pilotage that identifies the approximate position of a maritime channel, hazard, or administrative area to allow boats, ships, and seaplanes to navigate safely.
Read on WikipediaA sea is a very large body of salty water. The term has two distinct meanings. The first is the interconnected body of seawater that spans most of Earth, known as the sea or the ocean. The second is a named body of water: usually either a marginal sea, or a large, nearly landlocked body of water.
Read on WikipediaNoun