As a result, customs clearance is required when the vessel leaves the port of departure and again when the vessel arrives at the port of destination (unless the vessel is travelling under a Regular Shipping Service (RSS) scheme).
Selle tulemusena on vaja teha tollivormistus siis, kui laev lahkub lähtesadamast, ja uuesti, kui laev saabub sihtsadamasse (välja arvatud juhul, kui laev osaleb regulaarlaevaliinide kavas (RSS)).