Using the Able to make function, you can calculate which of the advertised vessels in your Tonnage list is able to make a certain port, within an ETA date range (estimated time of arrival), at a given speed.
To perform a Able to make calculation,
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The list will be automatically sorted by Ballast Duration (shortest to longest), followed by the ETA dates (earliest ETA to latest ETA) so that you can see the most economical tonnages first.