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![210-1.gif](../images/210-1.gif)
Figure 4.1.13 Navigation speed for the 25BC by the sea area, as an average of 1957-1990
![210-2.gif](../images/210-2.gif)
Figure 4.1.14 Navigation speed for the 40BC by the sea area, as an average of 1957-1990
![210-3.gif](../images/210-3.gif)
Figure 4.1.15 Navigation speed for the 50BC by the sea area, as an average of 1957-1990
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