Water, Waves, and Ships

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Water, Waves, and Ships
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Learn About
- Re-supplying at sea - Severe weather at sea -
Stability in wind and waves - Wave action on
boats and ships - US Coast Guard search and
rescue
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Learn More About

• Celestial Navigation
• Traditional Navigation
• Dead Reckoning

On the Internet
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A Ships stability is especially important
while re-supplying at seas
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Typhoon Cobra caught Admiral Haseys Third
Fleet unaware in December 1944.
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A ships stability is related to its buoyancy
and weight.
PAUSE Video Clip Here!

• Think About This
• A large cargo ship is leaving port with its 6
  holds
• (the area in which a ship carries cargo) full.
• It is going to make several stops.
• At each port, it will unload some of its cargo
  leaving a hold
• empty or partially empty.
• What can the captain order his crew to do in
  order to
• maintain the ships stability so that I will not
  capsize?

Engage in class discussion and then restart video
clip for demonstration of information required
for solution(s).
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• Why would the ship roll?
• What happens to the ships center
• of gravity when it does roll?

Now, think back to Typhoon Cobra. What do you
think happened to the ships caught in the
typhoon regarding their instability?
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• Crest - The highest part of the wave above the
  still-water line.
• Trough - The lowest part of the wave below the
  still-water line.
• Height - The vertical distance between the crest
  and the trough.
• Length - The horizontal distance between each
  crest or each trough.

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• Waves can cause several different
• movements in ships
• Sway
• Heave
• Yaw

Waves can affect the navigation of a ship!
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How would adding water to the boats hull,
provide additional stability?
Brainstorm Research What Kinds of boat
designs would Provide the most stability? Why?
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The effects of water and wave action are
important elements for navigating a ship and
maintaining its stability.