Vessel Timeline is a sophisticated plot diagram which displays useful information regarding a vessel's speed and draught profile during the past period (the reference period depends on each vessel's activity).
The red line indicates the vessel's speed while the blue area notates the vessel's draught. On top of these, you are able to see the most recent Port Calls of the vessel (Green icon for Arrivals - Red icon for Departures) as well as her current Destination (the Blue icon - when available).
It is very easy to get information for specific time or date. All you have to do is to hover your mouse's index over the plot diagram area. (Hovering over an icon will also inform you about the respective Port Call)
The date is presented on the horizontal axis while Speed and Draught are both presented on the vertical one (0 points is located in the middle of the axis so that Speed is presented above it while Draught is presented below it).
You can access the Vessel Timeline at any time from the Vessel Details page. Information, displayed on it, is constantly being updated - as soon as new data is recorded by MarineTraffic, it is taken into account.
Note: As a basic user, you should be able to look back on a Vessels Timeline a few hours. If you have purchased either the Vessel Events service or the Voyage Data service, you should be able to go further into the past. The maximum length (in terms of time) of the displayed track depends on the version you have purchased, 30 days for the Lite versions and 1 year for the Plus versions.