Ocean marine is the oldest insurance in the world and was developed to cover property transported by ocean vessels. Ocean marine now covers any property being transported over bodies of water. As good began to be transported of land on rails, a new form of insurance was born. Inland marine covers good being transported over land. Anything from a crane to a diamond necklace can be insured on a marine policy. Inland marine covers property transported over land. Ocean marine covers property transported over bodies of water.