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FAS has 2 main modes: Master Fleet Plan and Fleet Plan Scenario. In master mode you operate on the actual voyage data connected to VMS, and as such operations performed in VMS will affect what you see in master mode in FAS and vice versa. Scenario mode provides an environment where you can generate and modify complete fleet plan scenarios that is are 100% separated from the data in VMS. This provides the scheduler with a tool to easily build and test different schedules without affecting the master fleet plan data.
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