Casablanca is the Atlantic coast of Morocco, the country's largest general cargo port, and grain imports run in seasonal peaks that fill the silo berths, and the port shares Morocco's trade with the container hub at Tanger Med. Vessels on passage call for bunkers without loading cargo, and a bunker call is judged by one measure: how long the vessel is off passage. Maingate Shipping's bunker call agency at Casablanca is built around that measure.

The desk is appointed by owners, managers, operators and by the bunker traders and suppliers themselves. Where the supplier and the receiving vessel both nominate Maingate, one desk coordinates both sides of the delivery and the vessel receives one account.

Bunker deliveries are where quantity disputes are born. Surveyors for the vessel's interests attend soundings and sampling, the bunker delivery note is witnessed, and any protest is recorded at the time so that the owner has the evidence if the figures are argued later.