Antwerp-Bruges Port Authority and Port of Rotterdam Authority will make it mandatory to use a bunker measuring system (such as a Mass Flow Meter) on board bunker vessels to measure the exact amount of fuel delivered to sea-going vessels.This follows an independent study in both Antwerp and Zeebrugge and Rotterdam, which showed regular quantity issues in the bunker market. With the measure, the port authorities aim to make the ARA bunker market more transparent, efficient and reliable.During the first half of 2023, the port authorities will first identify suitable bunker measuring systems. They will also determine the date on which the obligation to bunker with a bunker measuring system on board bunkering vessels will enter into force in Antwerp and Zeebrugge as well as Rotterdam.The port authorities are aware that this measure will have a major impact on the bunker market. Therefore, they choose an ambitious yet realistic deadline. The different companies in the bunker chain will be given sufficient time to adapt to this measure. The requirement will be included in the licence for bunker fuel suppliers. Currently, 40 out of 170 bunker vessels in Rotterdam, Antwerp and Zeebrugge are equipped with a bunker measuring system.The introduction of a bunker measuring system will greatly improve efficiency. After all, data from transactions can be read digitally and immediately processed in the accounts.