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USCG Exam Practice · Tides and currents — predictions and corrections

Which of the following correctly describes the relationship between tidal currents and the tide?

  1. ATidal currents are driven primarily by wind and reverse direction with changes in wind speed
  2. BTidal currents are the vertical rise and fall of sea level associated with the gravitational pull of the moon
  3. CTidal currents are the horizontal flow of water associated with the rise and fall of the tide, reversing direction with the tide✓ correct
  4. DTidal currents flow continuously in one direction and are part of the major ocean gyre systems

Why C is correct

Bowditch Ch. 9 §903 defines tidal currents as the horizontal flow of water associated with the rise and fall of the tide, and Bowditch Ch. 24 §2401 confirms they reverse direction with the tide. Wind drives surface ocean currents, not tidal currents.

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