Sea cargo manifest and transhipment filings now require phased electronic submissions, ICEGATE registration, CIN usage and mandatory timelines. SCMTR, 2018 mandates advance electronic filing of sea arrival, departure and inland transhipment manifests and related declarations via ICEGATE by Authorised Sea Carriers/Agents, Authorised Carriers, and Authorised Transhippers; sets phased timelines (Annexure A) with transitional relief until 31 March 2021 and full mandatory compliance from 1 April 2021; prescribes use of Cargo Identification Numbers (PCIN/MCIN), timelines for amendments, bond and security requirements (with specified reductions and exemptions), and penalty exposure for non compliance.