Navigation Publication and Altitude Terms Quiz

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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?

Tidal Current Tables Signup and view all the answers

What is the speed of sound in water?

1.1 kilometers per second 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?

Range knob Signup and view all the answers

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

It increases. Signup and view all the answers

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

Directional Signup and view all the answers

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

Piezo‐hydraulic Signup and view all the answers

What may cause false echoes in an echo sounder?

Bioluminescent microorganisms in the water Signup and view all the answers

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

Torque‐induced precession Signup and view all the answers

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

Rapid error Signup and view all the answers

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

Sailing Directions Signup and view all the answers

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

Apparent Altitude Signup and view all the answers

A phase correction is applied to observations of:

The Moon 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.

50 m Signup and view all the answers

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

10 m Signup and view all the answers

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

Deviation Signup and view all the answers

What is the standard atmospheric pressure in millimeters of mercury?

760 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?

Switch to hand steering Signup and view all the answers

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

23 degrees 27' South Signup and view all the answers

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

Automatic pilot Signup and view all the answers

How long is a nautical mile in feet?

6,076 feet 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?

Astronomical twilight Signup and view all the answers

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

Align the compass north to the fore and aft line of the ship Signup and view all the answers

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

Diffraction Signup and view all the answers

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

Sight Reduction Signup and view all the answers