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- Apprentice Mate Steersman (Western Rivers (Any Appropriate Tonnage)) »
- Q426 - Navigation Problems: Chart Plot
58. As you pass under the Vicksburg Bridges, you estimate the current as 3.0 mph. What is the speed over the ground, if your vessel is making turns for 10.5 mph?
Speed over ground is calculated by adding the vessel's speed through the water and the aiding current. Therefore, the speed over the ground is 10.5 mph + 3.0 mph = 13.5 mph.
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