Navigation Publication and Altitude Terms Quiz
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Questions and Answers

What is the position obtained by applying estimated current and wind to your vessel's course and speed?

  • Estimated position (correct)
  • Applied position
  • Dead-reckoning position
  • Assumed position
  • What is the barometric pressure equivalent to 29.92 inches of mercury?

  • 1010.35 millibars
  • 1013.25 millibars (correct)
  • 1012.35 millibars
  • 1015.25 millibars
  • What does apparent altitude represent in celestial navigation?

  • Difference in assumed latitude and actual latitude
  • Chronometer error and dip
  • Inaccuracies in the reading and reference level (correct)
  • Double-second difference
  • Where can sailors find data on the direction and velocity of rotary tidal currents?

    <p>Tidal Current Tables</p> Signup and view all the answers

    What is the speed of sound in water?

    <p>1.1 kilometers per second</p> Signup and view all the answers

    On an echo sounder, what is used to mark a specific time of occurrence by drawing a line on the paper?

    <p><strong>Range knob</strong></p> Signup and view all the answers

    What happens to the speed of sound when the water salinity increases?

    <p>It increases.</p> Signup and view all the answers

    What is the nature of the beam transmitted by an echo sounder?

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

    Which of the following is a type of echo sounder transducer?

    <p>Piezo‐hydraulic</p> Signup and view all the answers

    What may cause false echoes in an echo sounder?

    <p>Bioluminescent microorganisms in the water</p> Signup and view all the answers

    What is the phenomenon in which the axis of an object wobbles when torque is applied?

    <p>Torque‐induced precession</p> Signup and view all the answers

    What error in a gyrocompass is caused by rapid changes in course, speed, and latitude?

    <p>Rapid error</p> Signup and view all the answers

    What publication contains ocean current information for voyage planning from Tokyo to San Francisco?

    <p>Sailing Directions</p> Signup and view all the answers

    What do you call the altitude after applying the Dip and index error?

    <p>Apparent Altitude</p> Signup and view all the answers

    A phase correction is applied to observations of:

    <p>The Moon</p> Signup and view all the answers

    When using GPS, you may expect your position to be accurate 95% of the time within a radius of __________ meters.

    <p>50 m</p> Signup and view all the answers

    When navigating using DGPS, you may expect your position to be accurate to within a radius of __________ meters.

    <p>10 m</p> Signup and view all the answers

    The compass rose on a nautical chart indicates both variation and __________.

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

    What is the standard atmospheric pressure in millimeters of mercury?

    <p>760</p> Signup and view all the answers

    When a ship's course starts slowly changing to the right at night with the gyro-pilot engaged, what action should be taken FIRST?

    <p>Switch to hand steering</p> Signup and view all the answers

    What is the Arctic Circle's latitude in degrees north or south of the Tropic of Cancer?

    <p>23 degrees 27' South</p> Signup and view all the answers

    What is the automatic device for steering a vessel by receiving control signals from a gyro compass called?

    <p>Automatic pilot</p> Signup and view all the answers

    How long is a nautical mile in feet?

    <p>6,076 feet</p> Signup and view all the answers

    What is the interval called between the sun's upper limb being on the horizon and its center being 12 degrees below?

    <p>Astronomical twilight</p> Signup and view all the answers

    Which check is NOT part of the physical checks of gyro, azimuth circle, and pelorus?

    <p>Align the compass north to the fore and aft line of the ship</p> Signup and view all the answers

    What is the term for the bending of a wave as it passes an obstruction?

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

    Which one is NOT typically found in tables used during voyage planning and navigation?

    <p>Sight Reduction</p> Signup and view all the answers

    In the IALA Buoyage System, what color configuration represents an East Cardinal Mark?

    <p>Black band above a yellow band</p> Signup and view all the answers

    Who typically holds responsibility for creating the voyage plan?

    <p>The navigation officer</p> Signup and view all the answers

    What information should the new helmsman know when relieving the helm?

    <p>Maximum rudder angle previously used</p> Signup and view all the answers

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