The system doesn't allow creating a bunker plan after vessel arrives in port. Vessel can stay in one port for a very long time, and it is possible that the decision to bunker the vessel can be made when the vessel is in port. If planned bunker cannot be updated, the bunker inventory information will not flow into the estimate correctly. Under Data center, we set LSGO as the backup fuel of VLSFO. If planned bunker cannot be created for VLSFO when the vessel is in port, the system will start calculating consumption of LSGO in the voyage.