For those in the shipping and freight industry, ‘shipped on board’ could be a familiar term. It means that specific goods have been received and loaded onboard the ship on the said date. Typically, shipped on board appears on all bills of lading.
It is a confirmation from the shipping company to the shipper or the party dispatching the goods that have been loaded onboard their ship. That sounds pretty straightforward, right?
Is it mandatory to show the shipped on board date on a bill of lading...
https://www.marineinsight.com/maritime-law/what-is-shipped-on-board-in-logistics/