When it comes to the prevention of marine pollution, SOPEP and SMPEP are at the top of the list. They are the vessel’s response plans and procedures in case you have a spill on board. You might have seen those big (sometimes small) yellow boxes on deck marked with SMPEP or SOPEP. What’s more...
https://www.seamanmemories.com/difference-between-sopep-and-smpep/