28 Questions
What happens to the speed of sound when water salinity increases?
It increases.
What is the nature of the beam transmitted by an echo sounder?
Directional
Which of the following is an echo sounder transducer type?
Magnetostriction
What may cause false echoes in an echo sounder?
Bioluminescent microorganisms in the water
Which phenomenon involves the axis of an object wobbling when torque is applied?
Torque‐induced precession
What error in a gyrocompass is caused by rapid changes in course, speed, and latitude?
Rapid error
What position is obtained by applying estimated current and wind to your vessel's course and speed?
Estimated position
Which reading is equivalent to a barometric pressure of 29.92 inches of mercury?
1013.25 millibars
What is the purpose of correcting apparent altitude in celestial navigation?
Inaccuracies in the reading and reference level
Where can mariners find information on the direction and velocity of rotary tidal currents?
Tidal Current Tables
What is the speed of sound in water?
1.1 kilometers per second
What frequency is typically used by the low-frequency pulse of an echo sounder?
18 kHz
What is the standard atmospheric pressure in millimeters of mercury?
760
When a vessel's course is slowly changing to the right at night with the gyro-pilot engaged, what action should be taken FIRST?
Switch to hand steering.
What is the Arctic Circle's latitude in relation to the Tropic of Cancer?
44 degrees 06' North
What is the automatic device for steering a vessel by receiving control signals from a gyro compass known as?
Gyropilot
How long is a nautical mile?
6,076 feet
What is the interval called between the sun's upper limb being on the horizon and its center being 12 degrees below?
Astronomical twilight
What is the deviation on the heading of 345°psc with a 2°E gyro error and a 13°W variation?
3° W
What do isogonic lines on a chart indicate?
Points of equal variation
What does the revision of a chart indicate?
Part of the title
On which area of a Mercator chart is the revision information typically printed?
Cylindrical projection
In the IALA Buoyage System, what color combination represents an East Cardinal Mark?
Black band above yellow band
What is the responsibility of the navigation officer in the voyage plan?
The navigation officer
When relieving the helm, what should the new helmsman be knowledgeable about?
Course per magnetic steering compass
Which action should be taken if a crew member falls overboard off the port side?
Immediately put the engine astern
What is the term used to describe the bending of a wave as it passes an obstruction?
Diffraction
Which physical check is NOT part of verifying gyro, azimuth circle, and pelorus on a ship?
Align the compass north to the fore and aft line of the ship
Test your knowledge on calculating compass deviation for marine navigation based on vessel's heading, variation, and gyro error. Choose the correct deviation amount among the options provided for different scenarios.
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