Visibility and Cloud Base Altitude Approximation Quiz
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Questions and Answers

What is the approximate geographic visibility of an object with a height above the water of 26.0 meters for an observer with a height of eye of 18.25 meters?

  • 24 nautical miles
  • 22 nautical miles
  • 20 nautical miles (correct)
  • 18 nautical miles

    • How would you approximate the height above sea level of the bases of the middle clouds?

  • The base is below 6,500 ft
  • The base is from sea level to 6,500 ft and above 20,000 ft
  • The base is approximately above 20,000 ft
  • The base is between 6,500 ft - 20,000 ft (correct)

    • What is the latitude of a place where the sun is exactly at the zenith of the observer at Local Apparent Noon (LAN) of 22nd or 23rd day of September?

  • Latitude 23 degrees 27 minutes South
  • Latitude 90 degrees 00 minutes South
  • Latitude 23 degrees 27 minutes North
  • Latitude 00 degrees 00 minutes (correct)

    • How would you define relative humidity?

    <p>It is the ratio of the existing absolute humidity to its saturation value at the same temperature.</p> Signup and view all the answers

    How would you describe relative humidity based on your understanding?

    <p>It is the ratio of the existing absolute humidity to its saturation value at the same temperature.</p> Signup and view all the answers

    What does a Global Positioning System (GPS) receiver measure to compute its position?

    <p>The difference in time from signal transmission to reception</p> Signup and view all the answers

    Which publication onboard should be referred to for reckoning the height of tides at a specific place?

    <p>The same tide tables as that used for the charts of the locality</p> Signup and view all the answers

    How can RADAR be helpful in weather forecasting when weather messages are incomplete or unavailable?

    <p>The radar beam is intersecting precipitating clouds, indicating front intensification</p> Signup and view all the answers

    What is the correct light color for the WEST cardinal marks used in IALA Region A and Region B?

    <p>White</p> Signup and view all the answers

    What is the wind speed range for a Beaufort force 8?

    <p>Wind speed 48 to 55 knots mean 52 knots</p> Signup and view all the answers

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