Podcast
Questions and Answers
What happens to the speed of sound when water salinity increases?
What happens to the speed of sound when water salinity increases?
- It increases. (correct)
- It remains the same.
- It decreases.
- It fluctuates.
What is the nature of the beam transmitted by an echo sounder?
What is the nature of the beam transmitted by an echo sounder?
- Directional (correct)
- Parabolic
- Linear
- Hyperbolic
Which of the following is an echo sounder transducer type?
Which of the following is an echo sounder transducer type?
- Piezo‐hydraulic
- Diesel‐electric
- Magnetostriction (correct)
- Blue‐diode
What may cause false echoes in an echo sounder?
What may cause false echoes in an echo sounder?
Which phenomenon involves the axis of an object wobbling when torque is applied?
Which phenomenon involves the axis of an object wobbling when torque is applied?
What error in a gyrocompass is caused by rapid changes in course, speed, and latitude?
What error in a gyrocompass is caused by rapid changes in course, speed, and latitude?
What position is obtained by applying estimated current and wind to your vessel's course and speed?
What position is obtained by applying estimated current and wind to your vessel's course and speed?
Which reading is equivalent to a barometric pressure of 29.92 inches of mercury?
Which reading is equivalent to a barometric pressure of 29.92 inches of mercury?
What is the purpose of correcting apparent altitude in celestial navigation?
What is the purpose of correcting apparent altitude in celestial navigation?
Where can mariners find information on the direction and velocity of rotary tidal currents?
Where can mariners find information on the direction and velocity of rotary tidal currents?
What is the speed of sound in water?
What is the speed of sound in water?
What frequency is typically used by the low-frequency pulse of an echo sounder?
What frequency is typically used by the low-frequency pulse of an echo sounder?
What is the standard atmospheric pressure in millimeters of mercury?
What is the standard atmospheric pressure in millimeters of mercury?
When a vessel's course is slowly changing to the right at night with the gyro-pilot engaged, what action should be taken FIRST?
When a vessel's course is slowly changing to the right at night with the gyro-pilot engaged, what action should be taken FIRST?
What is the Arctic Circle's latitude in relation to the Tropic of Cancer?
What is the Arctic Circle's latitude in relation to the Tropic of Cancer?
What is the automatic device for steering a vessel by receiving control signals from a gyro compass known as?
What is the automatic device for steering a vessel by receiving control signals from a gyro compass known as?
How long is a nautical mile?
How long is a nautical mile?
What is the interval called between the sun's upper limb being on the horizon and its center being 12 degrees below?
What is the interval called between the sun's upper limb being on the horizon and its center being 12 degrees below?
What is the deviation on the heading of 345°psc with a 2°E gyro error and a 13°W variation?
What is the deviation on the heading of 345°psc with a 2°E gyro error and a 13°W variation?
What do isogonic lines on a chart indicate?
What do isogonic lines on a chart indicate?
What does the revision of a chart indicate?
What does the revision of a chart indicate?
On which area of a Mercator chart is the revision information typically printed?
On which area of a Mercator chart is the revision information typically printed?
In the IALA Buoyage System, what color combination represents an East Cardinal Mark?
In the IALA Buoyage System, what color combination represents an East Cardinal Mark?
What is the responsibility of the navigation officer in the voyage plan?
What is the responsibility of the navigation officer in the voyage plan?
When relieving the helm, what should the new helmsman be knowledgeable about?
When relieving the helm, what should the new helmsman be knowledgeable about?
Which action should be taken if a crew member falls overboard off the port side?
Which action should be taken if a crew member falls overboard off the port side?
What is the term used to describe the bending of a wave as it passes an obstruction?
What is the term used to describe the bending of a wave as it passes an obstruction?
Which physical check is NOT part of verifying gyro, azimuth circle, and pelorus on a ship?
Which physical check is NOT part of verifying gyro, azimuth circle, and pelorus on a ship?
