Stream is just the terminology used to refer to any current in the water surrounding a boat. The compass rose in the game's UI (user interface) offers the choice to display the direction (but not strength) of this stream using a yellow arrow.

With refernce to the digital readout panel in the game's UI, the strength of a stream can be computed by comparing the BS and the SOG while the direction of the stream explains the difference between HDG and COG.

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