Professional mariners have a unique responsibility as they transit the world’s oceans. Mariners see a part of this earth that the vast majority of humanity will never witness and, in turn, they become stewards of the ocean by following the numerous regulatory measures aimed at reducing the impact of shipping on the environment. These regulations include, but certainly are not limited to, the use of AIS to avoid collisions and harmful oil spills, ballast water discharge controlling the introduction of invasive species, ship emissions control, and a ban on dumping of plastics at sea.