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| I don't pay for the full service, just use what's available for free but they do indicate the date & time when the ship pulls up to the dock and then again when it pulls away. If you follow those dates & times you can get a fair idea how long a ship took to load. In previous years, before the really busy season would start, it wasn't uncommon for a ship to remain docked a week or more. As the season got busy then the time at the dock would decrease to less than a week and then just a couple of days. I take that to indicate that beans were more available to load. Likewise when there was a trucker strike or rainy weather, it took longer to a ship.
The other good clue is the draft. The data stream shows the draft or how deep in the water the ship is riding. When a ship arrives with only 6 meters of draft but leaves three days later with 14 meters maximum published draft you can assume it left loaded. It's not uncommon for a ship to travel up the Amazon to a interior river port, take on half load then sail down the river and to another port to top off.
Using this kind of data, do I know exactly what's happening? No, but you can get fair idea if you just read the clues available to you.
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