India and Bangladesh signed an Agreement on Coastal Shipping on June 06, 2015. The Standard Operating Procedure (SOP) between the two countries was also signed on November 15, 2015, to implement the Coastal Shipping Agreement. The agreement seeks to promote two-way trade between India and Bangladesh through their respective ports.

Earlier shipping cargo used to ply between the countries through Colombo/Singapore/Klang ports. But this Agreement has enabled the direct regular movement of ships between India and Bangladesh and reduced delivery time from 25 to 7 days, with an estimated savings of approximately US$300 per container, which was observed in the case of Chittagong-Krishnapatnam container service.

Please read the Working Note from CUTS International at:
https://cuts-citee.org/pdf/working-note-india-bangladesh-coastal-shipping-agreement.pdf